Oil-injected screw air compressor

An oil-injected screw air compressor, comprising:

• a first stage compression chamber;
• an air buffering chamber coupled to the first stage compression chamber;
• a second stage compression chamber coupled to the air buffering chamber;
• an oil separating tank connected to the second stage compression chamber with an air pine to separate lubricating oil from compressed air of the second stage compression chamber;
• a plurality of control valves and a plurality of oil pipes;
• an oil cooler connected to the oil separating tank with one of the plurality of oil pipes to cool the lubricating oil for the first stage compression chamber, the air buffering chamber and the second stage compression chamber;
• a plurality of sensors respectively located at outlets of the first stage compression chamber, the air buffering chamber and the second stage compression chamber;
• and
• a controller respectively and dynamically controlling flow rates of the lubricating oil entering into the first stage compression chamber, the air buffering chamber and the second stage compression chamber according to outlet pressure and outlet temperature data measured by the sensors, and temperature data and humidity data of an environment, wherein the plurality of oil pipes further comprise a first stage lubricating oil pipe, an air buffering chamber lubricating oil pipe, and a second stage lubricating oil pipe;
• the plurality of control valves comprise a first control valve, a second control valve, and a third control valve;
• the oil cooler is connected directly to the first stage compression chamber via the first stage lubricating oil pipe and the first control valve;
• the oil cooler is connected directly to the air buffering chamber via the first stage lubricating oil pipe, the air buffering chamber lubricating oil pipe, and the second control valve;
• and
• the oil cooler is connected directly to the second stage compression chamber via the second stage lubricating oil pipe and the third control valve.