US 11,719,241 B2
Screw compressor having a lubrication path for a plurality of suction side bearings
Kotaro Chiba, Tokyo (JP); Masahiko Takano, Tokyo (JP); Shigeyuki Yorikane, Tokyo (JP); and Kenji Morita, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 17/288,374
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed Sep. 4, 2019, PCT No. PCT/JP2019/034776
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/084916, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 2018-201814 (JP), filed on Oct. 26, 2018.
Prior Publication US 2021/0381510 A1, Dec. 9, 2021
Int. Cl. F04C 18/16 (2006.01); F04C 29/02 (2006.01); F04C 29/00 (2006.01)
CPC F04C 18/16 (2013.01) [F04C 29/0007 (2013.01); F04C 29/02 (2013.01); F04C 29/026 (2013.01); F04C 2240/30 (2013.01); F04C 2240/52 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A screw compressor comprising:
a plurality of screw rotors;
a plurality of suction-side bearings that each rotatably support a suction side of the plurality of screw rotors and a plurality of discharge-side bearings that each rotatably support a discharge side of the plurality of screw rotors; and
a casing that houses the plurality of screw rotors, the plurality of suction-side bearings, and the plurality of discharge-side bearings, wherein
each of the plurality of screw rotors includes
a lobe section with a plurality of lobes, and
a suction-side shaft section and a discharge-side shaft section each disposed at both ends of the lobe section,
the casing has
a housing chamber that houses the lobe sections of the plurality of screw rotors, and
a lubrication path in which liquid that lubricates the plurality of suction-side bearings circulates, and
the lubrication path is a path in which respective passages to lubricate each of the plurality of suction-side bearings are connected in series and a most downstream part is connected to the housing chamber, wherein
the plurality of suction-side bearings include one suction-side bearing that supports one of the pair of screw rotors and an other suction-side bearing that supports other of the pair of screw rotors,
a one suction-side bearing chamber and an other suction-side bearing chamber are divided into multiple chambers,
the plurality of screw rotors are composed of a pair of screw rotors,
the lubrication path is configured through series connection of a liquid feed passage into which the liquid fed from external flows, a first passage to lubricate the one suction-side bearing, a second passage to lubricate the other suction-side bearing, and a collection liquid passage that communicates with the housing chamber in that order,
the other suction-side bearing chamber is divided into a primary chamber and a secondary chamber remoter from the housing chamber than the primary chamber across the other suction-side bearing, and
the collection liquid passage is connected to the primary chamber of the other suction-side bearing chamber.