Rotary compressor and refrigeration cycle apparatus

A rotary compressor comprising:

• a cylinder;
• a piston disposed within the cylinder so as to form a space between the piston itself and the cylinder;
• a shaft to which the piston is fitted;
• a first suction port for introducing a working fluid to be compressed into the cylinder;
• a first vane for dividing the space along a circumferential direction of the piston, the first vane being attached to the cylinder at a first angular position along a rotation direction of the shaft;
• and
• a second vane for further dividing the space divided by the first vane along the circumferential direction of the piston so that a first compression chamber and a second compression chamber having a smaller volume than the first compression chamber are formed within the cylinder, the second vane being attached to the cylinder at a second angular position along the rotation direction of the shaft,
• wherein the piston and the second vane are integrated together, or the piston and the second vane are coupled together,
• an angle θ between the first angular position and the second angular position is set to 270 degrees or more in the rotation direction of the shaft, so that the first compression chamber occupies an interior space of the cylinder from the first vane to the second vane in the rotation direction of the shaft, and
• no suction check valve is provided in the first suction port.