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US 2025/0154952 A1Published application
Uniaxial eccentric screw pump
AssigneeHEISHIN Ltd.
InventorsEiji UETSUJI, Noriaki SAKAKIHARA
Life of this patent
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Abstract
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.
Claims16
A uniaxial eccentric screw pump, comprising:
- 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,
- wherein 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.
1 more element
A uniaxial eccentric screw pump, comprising:
- 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,
- wherein the stator has the insertion hole being an opening in a cross section, the opening includes a middle area and two end areas, the two end areas include respective ends being boundary portions adjacent to the middle area, and at least one of the boundary portions has higher sealing tightness than at least a middle of the middle area.
1 more element
Dependencies are inferred from the claim text.