US 12,146,481 B2
Gas compressor
Ryota Iijima, Tokyo (JP); Kotaro Chiba, Tokyo (JP); and Nae Hisano, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Mar. 17, 2023, as Appl. No. 18/122,831.
Claims priority of application No. 2022-079598 (JP), filed on May 13, 2022.
Prior Publication US 2023/0366400 A1, Nov. 16, 2023
Int. Cl. F04B 39/02 (2006.01); F04B 49/06 (2006.01); F04B 51/00 (2006.01); F04C 18/14 (2006.01); F04C 28/08 (2006.01); F04C 28/28 (2006.01); F04C 29/02 (2006.01); F04C 29/04 (2006.01)
CPC F04B 39/0207 (2013.01) [F04B 49/065 (2013.01); F04B 51/00 (2013.01); F04C 28/08 (2013.01); F04C 28/28 (2013.01); F04C 29/021 (2013.01); F04C 29/026 (2013.01); F04C 29/04 (2013.01); F04C 18/14 (2013.01); F04C 2270/18 (2013.01); F04C 2270/19 (2013.01); F04C 2270/80 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A gas compressor including a compression mechanism that compresses a sucked working fluid, a separator tank that introduces lubricating oil to be supplied to the compression mechanism and a mixed fluid of the working fluid and the lubricating oil discharged from the compression mechanism and separates the lubricating oil from the compressed working fluid, an oil cooler that introduces and cools the lubricating oil separated in the separator tank, an oil circulation path that supplies the lubricating oil cooled by the oil cooler to the compression mechanism, and a motor that drives the compression mechanism and is isolated from the oil circulation path, the gas compressor comprising:
a suction temperature sensor that detects a suction temperature of the working fluid sucked into the compression mechanism;
a discharge pressure sensor that detects a discharge pressure of the working fluid compressed by the compression mechanism;
a rotation speed sensor that detects a rotation speed of the motor; and
a lubricating oil state estimation unit that estimates a temperature of the lubricating oil based on the detected suction temperature, discharge pressure, and rotation speed of the motor, wherein
the lubricating oil state estimation unit estimates a deterioration state of the lubricating oil based on the estimated temperature of the lubricating oil.