US 12,276,280 B2
Uniaxial eccentric screw pump with radial adjustment of the stator
Nobuhisa Suhara, Shiga (JP); and Takashi Sato, Shiga (JP)
Assigned to HEISHIN Ltd., Hyogo (JP)
Appl. No. 17/641,768
Filed by HEISHIN Ltd., Hyogo (JP)
PCT Filed Jun. 29, 2020, PCT No. PCT/JP2020/025449
§ 371(c)(1), (2) Date Dec. 21, 2023,
PCT Pub. No. WO2021/059641, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-172529 (JP), filed on Sep. 24, 2019.
Prior Publication US 2024/0125321 A1, Apr. 18, 2024
Int. Cl. F04C 2/107 (2006.01); F04C 15/00 (2006.01)
CPC F04C 2/1075 (2013.01) [F04C 2/1073 (2013.01); F04C 15/0046 (2013.01); F04C 2240/10 (2013.01); F04C 2240/802 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A uniaxial eccentric screw pump comprising:
a stator having a through hole whose inner surface is formed in a female screw shape;
a rotor that is a male screw shaft body inserted into the through hole of the stator;
a plurality of shims that are arranged on a radially outside of the stator in a range from one end to an other end of the stator, are in surface contact with an outer surface of the stator, are capable of compressing the stator by moving radially inward with respect to the stator, and have, on an outer surface, an inclined surface gradually inclined radially inward or outward toward one end; and
an adjustment member that is movable in an axial direction with respect to the stator and has a pressing part that can press the inclined surface of each of the shims, wherein
the incline surface of each of the plurality shims extends in a longitudinal direction of the stator so that at least half of a length of the inclined surface is within an inner side with respect to both of the one end and the other end in the longitudinal direction of the stator.