Rotary compressor with two discharge valves having different frequencies

A rotary compressor comprising:

• a case storing lubrication oil therein;
• a compression section including a cylinder arrangned in the case and first and second bearings fixed on both sides of the cylinder to define a compression chamber together with the cylinder, for compressing a fluid taken into the compression chamber;
• a drive section arranged in the case to drive the compression section;
• a first discharge mechanism including a first discharge port formed in the first bearing and a first discharge valve for opening and closing the first discharge port, for discharging a fluid compressed in the compression chamber into the outside of the compression chamber;
• a first muffler cover provided on the first bearing to cover the first discharge mechanism and defining a muffling chamber communicating with the first discharge port;
• a second discharge mechanism which involves a second discharge port formed in the second bearing and a second discharge valve for opening and closing the second discharge port, for discharging fluid compressed in the compression chamber into the outside of the compression chamber, the second discharge port having a cross sectional area at least one and a half times larger than that of the first discharg port;
• and
• a second muffler cover provided on the second bearing to cover the second discharge mechanism and defining a second muffling chamber communicating with the second discharge port, the second muffler cover being immersed in the lubrication oil, and the compression section having a passage, through which the second muffling chamber communicates with the first muffling chamber.