Rotary compressor with two or more suction parts

A vane type rotary compressor comprising:

• a cylinder casing constituted by a cylinder having a hollow interior and side plates closing the ends of said cylinder to define a rotor chamber in said hollow interior;
• a rotor rotatably mounted in said rotor chamber eccentrically of the axis thereof;
• a plurality of vanes slidably mounted on said rotor for sliding outwardly of said rotor into sliding engagement with the interior of said hollow interior during rotation of said rotor and defining vane chambers between said vanes, said rotor and said cylinder which increase and then decrease in size during rotation of said rotor;
• said casing having at least two suction ports therein opening into said vane chambers, said ports being spaced around said hollow interior in the direction of rotation of said rotor substantially equally to the circumferential spacing of said adjacent vanes;
• said compressor having the parameter K2 with the value 0.025<K2<0.080, wherein:
• K2=a.theta..sub.s /V.sub.o
• a=effective flow area of the suction port toward the compression direction
• .theta..sub.s =the angle through which the end of a vane has rotated from the top of said casing to the end of a suction stroke
• V.sub.o =maximum volume of a vane chamber.