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1. 发明授权

US11614084B2 Gas compressor 有权
公开(公告)号：US11614084B2
公开(公告)日：2023-03-28
申请号：US16496109
申请日：2018-01-30
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Ryusuke Oshiro
IPC分类号： F04B49/02 , F04C28/06 , F04C28/08 , F04C28/28 , F04B49/20
摘要： To prevent generation of drain reliably without depending on a difference in ambient temperature where a compressor is installed. Provided is a gas compressor: having a compressor main body compressing a gas, a drive source driving the compressor main body, a controller controlling the rotation speed of the drive source according to the discharge pressure of the compressor main body, and a temperature detector detecting the temperature of a discharge gas of the compressor main body; and performing no-load operation with the rotation speed of the drive source as a lower limit rotation speed when the discharge pressure reaches an upper limit pressure higher than a set pressure. When detecting that the temperature detected by the temperature detector is equal to or lower than a predetermined temperature during the no-load operation, the controller causes the lower limit rotation speed of the drive source to a lower limit rotation speed at which the temperature of the discharge gas is higher than the predetermined temperature and which is higher than a lower limit rotation speed when the detected temperature is higher than the predetermined temperature.

2. 发明授权

US10316845B2 Oil supply type compressor 有权
公开(公告)号：US10316845B2
公开(公告)日：2019-06-11
申请号：US15027836
申请日：2014-08-05
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Tomoyuki Kado , Ryusuke Oshiro
IPC分类号： F04C29/12 , F04C29/02 , F04C18/16
摘要： The invention is directed to reducing pressure-reduction time while preventing foaming in an oil-separation device during capacity control of a compressor, and to avoid startup congestion. This oil-supply-type compressor includes a main body, an oil-separation device, and an air-discharge passage for discharging compressed air during capacity control of the compressor. The air-discharge passage includes passages having large and small flow volumes, and when compressed air is discharged from the passage to the atmosphere during capacity control, the pressure in the oil-separation device is discharged using the large-flow-volume passage, until the pressure reaches or falls below a restarting-possible pressure, which is the pressure at which startup congestion does not occur when the compressor main body is restarted. When the pressure in the oil separation device reaches a prescribed pressure, which is less than or equal to the restarting-possible pressure and higher than a foaming pressure, the pressure is discharged using the small-flow-volume passage.

3. 发明授权

US10316842B2 Air compressor 有权
公开(公告)号：US10316842B2
公开(公告)日：2019-06-11
申请号：US15123352
申请日：2015-03-13
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Ryusuke Oshiro
IPC分类号： F04C28/06 , F04C28/24 , F04C29/12 , F04C29/02 , F04C28/28 , F04C18/16 , F04C29/00 , F04B39/10
摘要： To provide an air compressor capable of achieving energy saving. The air compressor is provided with a compressor body compressing air with injecting oil into a compression chamber; an air-pressure-operated intake throttle valve provided on an intake side of the compressor body; a separator provided on a delivery side of the compressor body and separating, from the compressed air delivered from the compressor body, a liquid contained in the compressed air; a compressed air system supplying the compressed air separated by the separator to a supply destination; an air release system connected to a primary side of a check valve in the compressed air system; an air-pressure-operated air release valve provided in the air release system; and an air-pressure operation circuit having a solenoid-operated three-way valve.

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