Oil Supply Type Compressor

摘要

The objective of the present invention is to reduce the pressure reduction time while preventing foaming in an oil separation device during capacity control of a compressor, and to avoid startup congestion and thus enable normal starting even when a portion provided in an air release pipe and having a small flow path cross-sectional area becomes clogged. This oil supply type compressor is equipped with a compressor main body, an oil separation device, and an air discharge passage for discharging compressed air during capacity control of the compressor. Furthermore, the air discharge passage is equipped with a passage having a large flow volume and a passage having a small flow volume, and when compressed air is discharged from the air discharge passage to the atmosphere during capacity control, the pressure in the oil separation device is discharged using the passage having a large flow volume, 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 is higher than a foaming pressure, which is the pressure at which foaming occurs when the pressure in the oil separation device is discharged quickly, the pressure is discharged using the passage having a small flow volume.

主权项

1. An oil supply type compressor, comprising:
a compressor body compressing air; an oil separation device separating lubricating oil from the compressed air compressed by the compressor body; piping for supplying, to a user side, the compressed air after flowing through the oil separation device; and an air release path for releasing the compressed air after flowing through the oil separation device in capacity control for the compressor, wherein: the air release path includes a high flow-rate flow path and a low flow-rate flow path; in the capacity control for the compressor, when the compressed air in the oil separation device is released through the air release path into the atmosphere, the high flow-rate flow path is used for air release until a pressure in the oil separation device becomes equal to or less than a restarting-possible pressure at which startup stall is not caused when the compressor body is restarted; and the low flow-rate flow path is used for air release when a pressure in the oil separation device reaches a predetermined pressure which is equal to or less than the restarting-possible pressure and also exceeds a foaming pressure at which foaming occurs due to a fast reduction in pressure in the oil separation device.