Abstract: A variable capacity rotary compressor is provided, in which a vane may be restricted by a pressure difference generated between both side surfaces of the vane when the compressor performs in a saving driving mode. The vane may be restricted quickly and stably by rapidly decreasing a pressure of a vane chamber by leaking a discharge pressure of the vane chamber to an inlet via a low pressure passage and thereby increasing a pressurizing force applied to a side surface of the vane relatively greater than a supporting force applied to a rear surface thereof. In this way, the vane may be prevented from being vibrated due to a weak restriction force of the vane when a power driving mode of the compressor is switched into the saving driving mode, which prevents noise from increasing due to design conditions, thereby enhancing a comfort feeling of a user.

Abstract: The present invention provides a 2 stage rotary compressor including a hermetic container (101), a 2 stage compression assembly provided in the hermetic container (101) and including a low pressure compression assembly (120), a middle plate (140) and a high pressure compression assembly (130), a low pressure refrigerant inflow portion (126) provided in the low pressure compression assembly (120) to introduce low pressure refrigerant, and a middle pressure refrigerant inflow portion (130a) provided in the high pressure compression assembly (130) to introduce middle pressure refrigerant compressed in the low pressure compression assembly (120), wherein a diameter of the middle pressure refrigerant inflow portion (130a) larger than 0.5 times of a diameter of the low pressure refrigerant inflow portion (126) and smaller than 1.1 times thereof.

Abstract: An apparatus and method for controlling an operation of a compressor are disclosed to enhance a compressor efficiency in each operation mode in operating a compressor in a power mode or power saving mode according to an external load. The apparatus for controlling an operation of a compressor, including: a controller that generates a control signal to select an operation mode of the compressor according to an operation load of the compressor; a compressor motor that includes a main coil and a sub-coil and is driven in one of a plurality of operation modes according to a control signal of the controller; and a power supply unit that applies power via capacitors each having a different capacitance to the sub-coil of the compressor motor according to a control signal of the controller.

Abstract: The present invention provides a 2 stage rotary compressor including a hermetic container (101) defining an outward appearance of the compressor (100), a 2 stage compression assembly provided in the hermetic Container, wherein a low pressure cylinder (121), a middle plate (140) and a high pressure cylinder (131) successively stacked from any one of upper and lower portions, and first discharge port (161p) discharging refrigerant compressed in the low pressure cylinder (121), and having an inner volume equivalent to 0.5% to 2.5% of an inner volume of the low pressure cylinder (121). A valve is installed on or under the discharge port. When the valve is opened, compressed refrigerant is discharged through the discharge port. When the valve is closed, refrigerant remains in the discharge port as much as the volume of the discharge port. Accordingly, refrigerant remaining in the discharge port is re-expanded in the cylinder to thereby cause a compression loss.

Abstract: Provided is a variable capacity rotary compressor, which has a passage for restricting a vane using a pressure applied towards a perpendicular direction to a direction of a motion of the vane. A ratio between a sectional area of the passage and a vane area of the vane facing the passage and receiving a restriction pressure applied thereto ranges from 1.5% to 16.4%, and accordingly the vane can smoothly perform a reciprocation upon a normal driving mode of the compressor and also the vane can be quickly restricted upon a saving driving mode of the compressor. Hence, the fast and stable restriction of the vane can prevent a vibration of the vane, so as to reduce noise generated from the compressor.

Abstract: A variable capacity rotary compressor is provided, in which a vane may be restricted by a pressure difference generated between both side surfaces of the vane when the compressor performs in a saving driving mode. The vane may be restricted quickly and stably by rapidly decreasing a pressure of a vane chamber by leaking a discharge pressure of the vane chamber to an inlet via a low pressure passage and thereby increasing a pressurizing force applied to a side surface of the vane relatively greater than a supporting force applied to a rear surface thereof. In this way, the vane may be prevented from being vibrated due to a weak restriction force of the vane when a power driving mode of the compressor is switched into the saving driving mode, which prevents noise from increasing due to design conditions, thereby enhancing a comfort feeling of a user.