Rotary compressor

A rotary compressor comprising:

• a housing comprising a main shell, a top cover and a bottom cover;
• 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 compression chamber in a center thereof, the compression chamber comprising a vane groove, a spring hole and a suction hole, wherein the spring hole is communicated with the vane groove;
• 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 the spring hole of the vane, so that the front end of the vane is in contact with the peripheral surface of the ring;
• 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 and passed through the upper support, the motor, the ring and the lower support;
• wherein the bottom cover is surrounded by a tripod, the tripod and the bottom cover is a one-piece structure, the tripod comprises a ring connection plate and a plurality of support parts, the support parts are arranged in a ring shape uniformly on an outside of the ring connection plate, each of the support parts comprises a support hole in a middle thereof;
• wherein the cylinder comprises a first end surface and a second end surface, an oil storage area is formed between the second end surface of the cylinder of the compression pump and the bottom cover of the housing for storing refrigerant oil;
• wherein an oil volume of the refrigerant oil is V, an inner diameter of the main shell is M, a distance between a bottom surface of the bottom cover and a bottom surface of the cylinder of the compression pump is H, and the following condition is satisfied:
• 25%≤V/(π(M/2)2H)≤40%;
• wherein the bottom cover comprises a step portion, the step portion comprises a ring-shaped area and a recessed area, wherein an outer diameter of the ring-shaped area is M1, an inner diameter of the recessed area is M2, and the following condition is satisfied:
• 2≤M1/M2≤3, wherein the recessed area extends below the support parts.