The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2024
Filed:
Aug. 16, 2021
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
Provided is an oil feed type air compressor which can increase the determination accuracy regarding a deterioration state of oil. An oil feed type air compressorincludes a compressor main body, a separatorthat separates oil from compressed air discharged from the compressor main body, and an oil feeding systemthat feeds the oil separated by the separatorinto a compression chamber of the compressor main body. The oil feeding systemincludes a temperature control valvethat adjusts a diversion ratio for an oil coolerand a diversion ratio for a bypass pipeaccording to a temperature of the oil. The oil feed type air compressorincludes pressure sensorsA andB located in the oil feeding system, a discharge temperature sensorlocated on the discharge side of the compressor main body, and a controllerthat computes, when it is estimated that the diversion ratio for the oil cooleris 100% from the temperature sensed by the discharge temperature sensorexceeding a predetermined value Td, a difference ΔP between the pressure sensed by the pressure sensorA and the pressure sensed by the pressure sensorB and determines a deterioration state of the oil in reference to the difference ΔP.