US 12,460,640 B2
Complex screw rotors with a central circular cross section connecting right-hand and left-hand sections of the rotors
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 Aug. 30, 2024, as Appl. No. 18/821,391.
Application 18/821,391 is a continuation of application No. 18/312,057, filed on May 4, 2023, granted, now 12,110,888.
Application 18/312,057 is a continuation of application No. 17/229,331, filed on Apr. 13, 2021, granted, now 11,644,034, issued on May 9, 2023.
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 62/248,858, filed on Oct. 30, 2015.
Claims priority of provisional application 62/248,785, filed on Oct. 30, 2015.
Claims priority of provisional application 62/248,832, filed on Oct. 30, 2015.
Claims priority of provisional application 62/248,811, filed on Oct. 30, 2015.
Prior Publication US 2024/0426298 A1, Dec. 26, 2024
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)] 10 Claims
OG exemplary drawing
 
1. A screw compressor or expander comprising:
a female rotor including a first section having a right-hand first groove and a second section having a left-hand second groove, wherein the first groove has a first variable helix, the second groove has a second variable helix, and the female rotor has a first variable profile and a first variable outer diameter; and
a male rotor including a third section having a left-hand first lobe and a fourth section having a right-hand second lobe, wherein the first lobe has a third variable helix, the second lobe has a fourth variable helix, and the male rotor has a second variable profile and a second variable outer diameter,
wherein the female rotor includes a first central section positioned between the first section and the second section and the male rotor includes a second central section positioned between the third section and the fourth section, and wherein the female rotor transitions to a substantially circular cross section at the first central section and the male rotor transitions to a substantially circular cross section at the second central section.