Rotary compressor

A rotary compressor comprising:

• a housing comprising an outlet pipe;
• a motor located in the housing;
• a compression pump located in the housing and below the motor, the compression pump comprising:
• a cylinder comprising a first end portion and a second end portion, the cylinder comprising a compression chamber located in a center of the cylinder and running through an upper and a lower end of the cylinder, a wall of the compression chamber including a vane groove, a spring hole, a suction hole and a bypass port, wherein the spring hole is communicated with the vane groove;
• and wherein the suction hole, the vane groove and the spring hole are independent of each other and are not communicated with each other;
• a ring rotatably located in the compression chamber of the cylinder;
• a vane reciprocally moved in the vane groove of the cylinder, a front end of the vane and a peripheral surface of the ring are in contact with each other;
• at least one spring located at a back end of the vane;
• an upper support located in the housing and above the cylinder;
• a lower support located in the housing and below the cylinder;
• and
• a crankshaft located in the housing for disposing the upper support, the motor, the ring and the lower support;
• and
• a high-pressure chamber communication apparatus located on one side of the housing, wherein the high-pressure chamber communication apparatus is communicated with the housing and with the bypass port of the cylinder of the compression pump, so as to enable a refrigerant gas inside the housing flow to the bypass port and flow enter into the compression chamber.