US 12,410,792 B2
Uniaxial eccentric screw pump
Eiji Uetsuji, Shiga (JP); and Noriaki Sakakihara, Osaka (JP)
Assigned to HEISHIN Ltd., Hyogo (JP)
Appl. No. 18/727,074
Filed by HEISHIN Ltd., Hyogo (JP)
PCT Filed Sep. 20, 2022, PCT No. PCT/JP2022/034893
§ 371(c)(1), (2) Date Jul. 6, 2024,
PCT Pub. No. WO2023/139844, PCT Pub. Date Jul. 27, 2023.
Claims priority of application No. 2022-005901 (JP), filed on Jan. 18, 2022.
Prior Publication US 2025/0154952 A1, May 15, 2025
Int. Cl. F04C 2/107 (2006.01)
CPC F04C 2/1075 (2013.01) [F04C 2230/91 (2013.01); F05C 2253/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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 middle area has a lower elastic modulus at least in the middle of the middle area than at two ends of the middle area, 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.