A
rotary compressor with a low-pressure chamber and an air conditioner are disclosed. The
rotary compressor with a low-pressure chamber includes a housing (100), a motor
assembly and a pump
assembly. The housing (100) is provided with a low-pressure air inlet component (120) and a high-pressure air outlet component (130), a low-pressure chamber (110) is arranged in the housing (100), the motor
assembly is arranged in the low-pressure chamber (110). The motor assembly includes a
stator (231) and a rotor (232). The pump assembly includes a
crankshaft (210), a
crankshaft shell (220), a cylinder (310), a
piston (340), a sliding vane (330) and a bearing (320), the pump assembly is arranged in the low-pressure chamber (110). The
piston (340), the sliding vane (330), the cylinder (310), the bearing (320) and the
crankshaft shell (220) cooperatively form a compression chamber. A low-pressure
refrigerant directly cools the rotor (232) and the
stator (231), and the low-pressure
refrigerant is heated to vaporize, so as to increase a temperature of a gaseous
refrigerant before compression. The cylinder (310), the bearing (320) and the sliding vane (330) arranged in the low-pressure chamber (110) are fully cooled to minimize
thermal expansion and deformation. The
piston (340) and the crankshaft (210) are arranged in the cylinder (310), so that internal heat cannot be effectively dissipated in time, obtaining a large
thermal expansion and deformation, and thus effectively strengthening the sealing performance between the cylinder (310) and the piston (340) and improving the compression effect on the refrigerant.