Oil-level controller for compressor

A compressor having a function of controlling an oil level, comprising:

• a casing (2);
• a compression mechanism (3) for compressing a compression gas, which is housed in said casing (2) and includes a low pressure part of which gas pressure is low;
• a lubricant reservoir (2c) for storing a lubricant (L), which is provided at the bottom of said casing (2), and in which an upper limit of the oil level of the lubricant (L) is predetermined, the lubricant (L) of said lubricant reservoir (2c) being supplied to said compression mechanism (3);
• a drive mechanism (4) for driving said compression mechanism (3), which is housed in said casing (2) and includes a drive shaft (10);
• a lubricant takeout pipe (15) for taking out said lubricant (L), an outlet end of which is connected to the low pressure part of said compression mechanism (3);
• and
• pump means provided at said lubricant reservoir (2c), a suction end of which is open at the upper limit of the oil level of said lubricant reservoir (2c) and a discharge end of which is connected to an inflow end of a lubricant takeout pipe (15), said pump means being driven by means of said drive mechanism;
• wherein said pump means (20) discharges said lubricant (L) from said lubricant reservoir (2c) to the low pressure part of said compression mechanism (3) when the oil level of said lubricant (L) in said lubricant reservoir (2c) goes beyond the predetermined upper limit of the oil level thereof.