Patent ID: 8882482

Claim:
A compressor comprising: a compressing portion that is located in a housing to compress refrigerant; an oil separation chamber to which refrigerant is introduced from the compressing portion, wherein the oil separation chamber has a peripheral wall for causing refrigerant to swirl to separate lubricant oil mixed in the refrigerant; and an auxiliary oil reservoir chamber and a main oil reservoir chamber that retain lubricant oil that is separated from refrigerant, wherein a part of the auxiliary oil reservoir chamber is defined by the peripheral wall of the oil separation chamber, and an introducing passage for introducing lubricant oil in the oil separation chamber to the auxiliary oil reservoir chamber is formed in the peripheral wall, the introducing passage has an inlet located at one end and an outlet located at the other end, the inlet of the introducing passage opens to the oil separation chamber on an inner surface of the peripheral wall, and the outlet of the introducing passage opens to the auxiliary oil reservoir chamber, wherein the inlet of the introducing passage is located at a lower part of the oil separation chamber in the direction of gravity, and the outlet of the introducing passage is located above the inlet of the introducing passage in the direction of gravity and at a lower part of the auxiliary oil reservoir chamber in the direction of gravity, and the main oil reservoir chamber is located below the auxiliary oil reservoir chamber in the direction of gravity, wherein a drain port is formed in a bottom wall of the auxiliary oil reservoir chamber, the drain port drains lubricant oil in the auxiliary oil reservoir chamber to the main oil reservoir chamber, and lubricant oil in the main oil reservoir chamber is supplied to a suction-side structure of the compressing portion.