US 11,905,950 B2
Screw pump with improved sealing and bearing assembly
Victor Hall, Camden, SC (US); Dennis Fowler, Monroe, NC (US); Vasanth Krishnasamy, Chennai (IN); Simon Bradshaw, Glasgow (GB); and Axel Jaeschke, Lehrte (DE)
Assigned to CIRCOR PUMPS NORTH AMERICA, LLC., Monroe, NC (US)
Appl. No. 17/791,990
Filed by CIRCOR PUMPS NORTH AMERICA, LLC., Monroe, NC (US)
PCT Filed Jan. 24, 2020, PCT No. PCT/US2020/014918
§ 371(c)(1), (2) Date Jul. 11, 2022,
PCT Pub. No. WO2021/150240, PCT Pub. Date Jul. 29, 2021.
Prior Publication US 2023/0052329 A1, Feb. 16, 2023
Int. Cl. F01C 19/00 (2006.01); F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 2/00 (2006.01); F04C 15/00 (2006.01); F04C 2/16 (2006.01)
CPC F04C 15/0038 (2013.01) [F04C 2/16 (2013.01); F04C 2230/602 (2013.01); F04C 2240/30 (2013.01); F04C 2240/50 (2013.01); F04C 2240/805 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A screw pump comprising:
a casing including an internal chamber;
first and second rotors rotatably positioned within the chamber of the casing, the first and second rotors including intermeshing threaded-shape profiling; and
a plurality of bearing seal assemblies, a bearing seal assembly positioned at each end of the first and second rotors, each bearing seal assembly including:
a bearing positioned about an end portion of a respective one of the first rotor or the second rotor to facilitate rotation of the respective one of the first rotor or the second rotor; and
a seal positioned about an end portion of the respective one of the first rotor or the second rotor to seal passage of the respective one of the first rotor or the second rotor through the casing;
wherein the seal includes an axially extending projection and the bearing is arranged and configured to receive the axially extending projection; and
wherein the bearing is coupled to the seal so that the seal is secured to the casing via compressive forces induced by a coupling of the bearing to the casing.