US 12,078,169 B2
Complex screw rotors having multiple helical profiles joined by a centeral portion with a pocket
Luke Gray, Loraine, IL (US); Taylor Stratman, Quincy, IL (US); Bernard Conley, Palmyra, MO (US); Brent Ransdell, Warsaw, MO (US); and Daniel Peana, Springfield, MO (US)
Assigned to INDUSTRIAL TECHNOLOGIES AND SERVICES, LLC, Davidson, NC (US)
Filed by INDUSTRIAL TECHNOLOGIES AND SERVICES, LLC, Davidson, NC (US)
Filed on May 4, 2023, as Appl. No. 18/312,057.
Application 18/312,057 is a continuation of application No. 17/229,331, filed on Apr. 13, 2021, granted, now 11,644,034.
Application 17/229,331 is a continuation of application No. 15/760,086, granted, now 10,975,867, issued on Apr. 13, 2021, previously published as PCT/US2016/059613, filed on Oct. 29, 2016.
Claims priority of provisional application 62/248,785, filed on Oct. 30, 2015.
Claims priority of provisional application 62/248,811, filed on Oct. 30, 2015.
Claims priority of provisional application 62/248,832, filed on Oct. 30, 2015.
Claims priority of provisional application 62/248,858, filed on Oct. 30, 2015.
Prior Publication US 2023/0272797 A1, Aug. 31, 2023
Int. Cl. F04C 18/08 (2006.01); F04C 18/16 (2006.01); F04C 18/20 (2006.01)
CPC F04C 18/084 (2013.01) [F04C 18/088 (2013.01); F04C 18/16 (2013.01); F04C 18/20 (2013.01); F04C 2240/20 (2013.01); F04C 2250/201 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A screw compressor or expander comprising:
a female rotor including a first section having a first groove with a right-hand helical profile, a second section having a second groove with a left-hand helical profile, and a first central section having a first curved transition connecting the first and second groove; and
a male rotor including a third section having a first lobe with a right-hand helical profile, a fourth section having a second lobe with a lefthand helical profile, and a second central section having a second curved transition connecting the first and second lobes, wherein the first and second curved transitions each have a substantially rounded configuration, and wherein at least one of the first and second curved transitions includes a pocket formed in a surface of the at least one of the first and second curved transitions, the pocket configured to relieve air trapped by the at least one of the first and second curved transitions.