Liquid-cooled rotary compressor and coolant supply method therefor

A liquid-cooled rotary compressor including a compressor main body that forms a compression chamber by a fixed wall and a rotor and a liquid injection path that injects a coolant into the compression chamber and adjusts a discharge flow rate by changing a load factor of the compressor main body, the liquid-cooled rotary compressor comprising:

• a liquid amount adjusting unit that adjusts an amount of the coolant supplied from the liquid injection path to the compressor main body according to a change in the load factor of the compressor main body;
• and
• a compressed gas supply path configured to supply compressed gas to a downstream side of the liquid amount adjusting unit in the liquid injection path,
• wherein the compressed gas is supplied from the compressed gas supply path to the liquid injection path according to the amount of the coolant supplied to the compressor main body,
• wherein the fixed wall is a casing of the liquid-cooled rotary compressor,
• wherein the casing is provided with a suction port through which gas is sucked, a discharge port through which compressed gas is discharged, and an injection port through which liquid is injected into the compression chamber,
• wherein the liquid injection path is connected to the injection port,
• wherein the liquid injection path includes a first flow rate adjusting valve as the liquid amount adjusting unit and a gas-liquid mixing unit provided on a downstream side of the first flow rate adjusting valve,
• wherein the compressed gas supply path is connected to the gas-liquid mixing unit, and
• wherein a second flow rate adjusting valve is provided in the compressed gas supply path.