US 12,385,490 B2
Gas compressor
Shigeyuki Yorikane, Tokyo (JP); Kenji Morita, Tokyo (JP); and Yuta Kajie, Tokyo (JP)
Assigned to HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD., Tokyo (JP)
Appl. No. 18/026,362
Filed by HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD., Tokyo (JP)
PCT Filed Sep. 10, 2021, PCT No. PCT/JP2021/033266
§ 371(c)(1), (2) Date Mar. 15, 2023,
PCT Pub. No. WO2022/065072, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 2020-160658 (JP), filed on Sep. 25, 2020.
Prior Publication US 2023/0366391 A1, Nov. 16, 2023
Int. Cl. F04C 28/08 (2006.01); F04B 49/03 (2006.01); F04B 49/20 (2006.01); F04C 28/06 (2006.01); F04C 28/24 (2006.01)
CPC F04C 28/08 (2013.01) [F04B 49/03 (2013.01); F04B 49/20 (2013.01); F04C 28/06 (2013.01); F04C 28/24 (2013.01); F04B 2205/05 (2013.01); F04C 2270/051 (2013.01); F04C 2270/0525 (2013.01); F04C 2270/185 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A gas compressor comprising:
an electric motor;
a compressor body that is driven by the electric motor and compresses a gas;
a pressure sensor arranged on a delivery side of the compressor body;
at least one of a suction throttle valve capable of closing a suction side of the compressor body and an air release valve capable of releasing gas from the delivery side of the compressor body; and
a controller that switches between load operation and no-load operation by controlling at least one of the suction throttle valve and the air release valve according to a delivery-side pressure sensed by the pressure sensor, and also controls a rotation speed of the electric motor,
wherein the controller is configured to:
compute a capacity of an air supply system that supplies a compressed gas generated by the gas compressor to a use location of the compressed gas, on a basis of load operation duration and no-load operation duration, and
set a target rotation speed of the electric motor at a time of no-load operation on a basis of the capacity of the air supply system.