US 12,313,069 B2
Screw compressor
Shuhei Nagata, Tokyo (JP); Shigeyuki Yorikane, Tokyo (JP); Kenji Morita, Tokyo (JP); Yuta Kajie, Tokyo (JP); and Kotaro Chiba, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 18/273,848
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed May 27, 2022, PCT No. PCT/JP2022/021846
§ 371(c)(1), (2) Date Jul. 24, 2023,
PCT Pub. No. WO2022/255275, PCT Pub. Date Dec. 8, 2022.
Claims priority of application No. 2021-092296 (JP), filed on Jun. 1, 2021.
Prior Publication US 2025/0075698 A1, Mar. 6, 2025
Int. Cl. F04C 2/16 (2006.01); F04C 15/00 (2006.01)
CPC F04C 2/16 (2013.01) [F04C 15/0038 (2013.01); F04C 15/0088 (2013.01); F04C 2240/50 (2013.01); F04C 2240/60 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A screw compressor for compressing a working medium, comprising:
first and second screw rotors that suck, compress, and deliver the working medium;
a first bearing that freely rotatably supports one end side of the first screw rotor whose one end side is coupled to a rotating shaft of a power source;
a casing that houses the first screw rotor and the first bearing;
a shaft sealing member that is located on an opposite side of a tooth profile unit for the first screw rotor relative to the first bearing inside the casing and seals a through hole in the casing, through which a shaft of the first screw rotor coupled to the rotating shaft of the power source is inserted;
a partition wall that isolates the first bearing from the shaft sealing member inside the casing; and
a liquid supply route that is provided in the casing and has a first liquid supply opening for supplying a lubricating liquid to the shaft sealing member and a second liquid supply opening for supplying the lubricating liquid to the first bearing.