Rotary compressor

A rotary compressor, comprising:

• a rotational shaft;
• first and second bearings configured to support the rotational shaft in a radial direction;
• a cylinder disposed between the first and second bearings to form a compression space;
• a rotor disposed in the compression space to form a contact point forming a predetermined gap with the cylinder and coupled to the rotational shaft to compress a refrigerant as the rotor rotates;
• and
• at least one vane slidably inserted into the rotor, the at least one vane coming into contact with an inner peripheral surface of the cylinder to separate the compression space into a plurality of regions, wherein the at least one vane comprises a pin that extends upward or downward;
• wherein a lower surface of the first bearing or an upper surface of second bearing comprises a rail groove into which the pin is inserted;
• wherein coordinates of the inner peripheral surface of the cylinder satisfy the following Equations:
• x2_2=x4−rv cos θr3, where x2_2 is an x-coordinate of the inner peripheral surface of the cylinder, x4 is an x-coordinate of a radial center of a distal end surface of the at least one vane, rv is a radius of the distal end surface of the at least one vane, and θr3 is a rotational angle of the radial center of the distal end surface of the at least one vane with respect to a center of a basic circle of the rail groove;
• and
• y2_2=y4+rv sin θr3, where y2_2 is a y-coordinate of the inner peripheral surface of the cylinder, y4 is a y-coordinate of the radial center of the distal end surface of the at least one vane, rv is the radius of the distal end surface of the at least one vane, and θr3 is the rotational angle of the radial center of the distal end surface of the at least one vane with respect to the center of the basic circle of the rail groove;
• wherein coordinates of the radial center of the distal end surface of the at least one vane satisfy the following Equations:
• x4=x3−(lv−rv) cos θc, where x4 is an x-coordinate of the radial center of the distal end surface of the at least one vane, x3 is an x-coordinate of the basic circle of the rail groove, lv is a distance between the inner peripheral surface of the cylinder and the basic circle of the rail groove, rv is the radius of the distal end surface of the at least one vane, and θc, is a rotational angle of the rotor, and
• y4=y3+(lv−rv) sin θc, where y4 is a y-coordinate of the radial center of the distal end surface of the at least one vane, y3 is a y-coordinate of the basic circle of the rail groove, lv is the distance between the inner peripheral surface of the cylinder and the basic circle of the rail groove, rv is the radius of the distal end surface of the at least one vane, and θc is the rotational angle of the rotor, wherein the distance between the inner peripheral surface of the cylinder and the basic circle of the rail groove is a distance on a straight line that passes through the inner peripheral surface of the cylinder and a center of an outer peripheral surface of the rotor;
• wherein the distal end surface of the at least one vane facing the inner peripheral surface of the cylinder is formed in a curved shape;
• wherein the basic circle of the rail groove is formed in a circular shape, and the outer peripheral surface of the rotor is formed in a circular shape;
• wherein the basic circle of the rail groove and the inner peripheral surface of the cylinder are concentric with each other;
• wherein the center of the basic circle of the rail groove is eccentric with respect to the center of the outer peripheral surface of the rotor, wherein a straight line that passes through the at least one vane in a direction perpendicular to the rotational shaft passes through the center of the outer peripheral surface of the rotor;
• wherein the distal end surface of the at least one vane facing the inner peripheral surface of the cylinder and the inner peripheral surface of the cylinder are not in contact with each other;
• and wherein the distance between the distal end surface of the at least one vane facing the inner peripheral surface of the cylinder and the inner peripheral surface of the cylinder is 10 μm to 20 μm.