公开(公告)号：US10920760B2

公开(公告)日：2021-02-16

申请号：US16065499

申请日：2016-10-19

申请人： Hitachi, Ltd.

发明人： Masanao Kotani ,  Takeshi Tsuchiya ,  Ryoji Kawai ,  Sachio Sekiya

IPC分类号： F04B39/06 ,  F04B39/16 ,  F25B5/04 ,  F04B39/02 ,  F25B5/02 ,  F04B41/06 ,  F25B31/00

摘要： An oil—cooled air compressor is provided with: an oil—cooled air compressor for compressing sucked-in air and discharging the compressed air; an oil separator for separating the compressed air and lubricating oil, which are discharged from the air compressor body; an oil cooler for cooling, by outside air, lubricating oil discharged from the oil separator; oil supply pipe passage for supplying lubricating oil, which is discharged from the oil cooler, to a bearing of the air compressor body and to an intermediate section in the process of compression by the air compressor; and an after-cooler for cooling, by outside air, air discharged from the oil separator. The oil-cooled air compressor in which the air compressor, the oil separator, the oil cooler, and the after-cooler are connected to supply high-pressure air to the outside of the compressor is provided with a vapor compression type refrigeration cycle.

公开(公告)号：US10995756B2

公开(公告)日：2021-05-04

申请号：US16312382

申请日：2017-03-24

申请人： Hitachi, Ltd.

发明人： Masanao Kotani ,  Takeshi Tsuchiya ,  Ryoji Kawai ,  Kotaro Chiba ,  Minako Kanada ,  Sachio Sekiya

IPC分类号： F04C29/02 ,  F04C29/04 ,  F04B39/16 ,  F04B39/02

摘要： Provided is an air compressor which helps to attain a proper discharge air temperature and which is superior in energy saving property. There are provided an air line connecting an air compressor, an oil separator, and an after cooler; an oil circulation line connecting the air compressor, the oil separator, and an oil cooler; a bearing oil supply line connecting one end of an intermediate branching portion disposed at an intermediate point of the oil circulation line between the oil cooler and the air compressor to a bearing oil supply portion of the air compressor; an intermediate portion oil supply line connecting the other end of the intermediate branching portion to an intermediate oil supply portion of the air compressor; a branching line supplying oil to the bearing oil supply portion and the intermediate oil supply portion; a blower sending air to the oil cooler and the after cooler; a bypass line connecting one end of a bypass branching portion disposed at an intermediate point of the oil circulation line between the oil separator and the oil cooler to the downstream side of the oil cooler of the bearing oil supply line; and a control valve controlling the inflow amount of the lubricating oil to the bypass line.