Compressor, air conditioner and method for assembling compressor

A compressor comprising:

• a first cylinder;
• a second cylinder comprising a sliding vane slot, an intake channel, and a variable-volume control cavity, wherein the first cylinder is positioned coaxial to the second cylinder;
• a partition disposed between the first cylinder and the second cylinder, wherein:
• the partition comprises a first portion having a first annular groove, and a second portion having a second annular groove,
• the first annular groove and the second annular groove form a receiving cavity body for storing refrigerant compressed by the second cylinder, and
• the variable-volume control cavity is in fluid communication with the intake channel, wherein the intake channel is configured to receive high-pressure refrigerant or low-pressure refrigerant;
• a sliding vane disposed in the sliding vane slot;
• and
• a locking pin disposed adjacent to the second cylinder and located at a side of the sliding vane, wherein the locking pin has a locking position for locking the sliding vane and an unlocking position for releasing the sliding vane from the locking position, further wherein when the sliding vane is in the locking position, the second cylinder is in an idling state, and further wherein when the sliding vane is in the unlocking position, the second cylinder is in an operating state;
• a volume ratio of a volume of the first cylinder to a volume of the second cylinder is Q:
• 0.3<Q<0.7, R1<R2 and H1<H2, wherein R1 is an inner diameter of the first cylinder, H1 is a height of the first cylinder, R2 is an inner diameter of the second cylinder, and H2 is a height of the second cylinder.