Oil-cooled type compressor

An oil-cooled compressor, comprising:

• a compressor body;
• a discharge flow passage for leading a compressed gas compressed by said compressor body to outside of said oil-cooled type compressor;
• a first oil separation means for separating oil discharged accompanied by said compressed gas from said compressed gas;
• an oil separation recovering portion housing said first oil separation means to recover the separated oil;
• an oil flow passage for leading the oil recovered by said oil separation recovering portion to an oiling portion within said compressor body through an oil cooler;
• an inspecting flow passage branched from said discharge flow passage on the downstream side of said oil separation recovering portion and in communication with a portion lower in pressure than said branched point;
• a second oil separation means capable of separating oil particles from the compressed gas flowing through said inspecting flow passage;
• and
• an oil separation detector for detecting that oil separated by said second oil separation means drops from said second oil separation means, said oil separation detector comprising an oil detection means for electrically detecting a state change caused by contact with the oil dropped from said second oil separation means, and a calculating portion for receiving an electric signal from said oil detection means to calculate the percentage content of oil of said compressed gas from said electric signal.