Rotary compressor

A rotary compressor, comprising:

• a rotational shaft;
• a first bearing and a second bearing that each supports the rotational shaft in a radial direction;
• a cylinder disposed between the first bearing and the second bearing and forming a compression space;
• a roller disposed in the compression space and coupled to the rotational shaft to compress a refrigerant in response to rotation of the roller;
• and
• at least one vane slidably inserted into the roller and in contact with an inner circumferential surface of the cylinder, dividing the compression space into a plurality of compression chambers, wherein each of the at least one vane comprises a pin that extends in an axial direction of the rotational shaft, wherein an inner surface of the first bearing or an inner surface of the second bearing comprises a rail groove into which the pin is inserted, and wherein coordinates of a base circle of the rail groove satisfies the following equations:
• xr2=x2+(lv+Δl) cos θc, where xr2 denotes an x-coordinate of the base circle of the rail groove, x2 denotes an x-coordinate of the inner circumferential surface of the cylinder, lv denotes a distance between the inner circumferential surface of the cylinder and the base circle of the rail groove, Δl denotes a distance between the inner circumferential surface of the cylinder and the at least one vane, and θc denotes a rotational angle of the roller;
• and
• yr2=y2−(lv+Δl) sin θc where yr2 denotes an y-coordinate of the base circle of the rail groove, y2 denotes an y-coordinate of the inner circumferential surface of the cylinder, lv denotes a distance between the inner circumferential surface of the cylinder and the base circle of the rail groove, Δl denotes a distance between the inner circumferential surface of the cylinder and the at least one vane, and θc denotes the rotational angle of the roller;
• wherein the distance between the inner circumferential surface of the cylinder and the base circle of the rail groove is a distance on a straight line that passes from the inner circumferential surface of the cylinder to a center of an outer circumferential surface of the roller;
• wherein the distance between the inner circumferential surface of the cylinder and the at least one vane is a distance on a straight line that passes from the inner circumferential surface of the cylinder to the center of the outer circumferential surface of the roller;
• wherein a front end surface of the at least one vane facing the inner circumferential surface of the cylinder is formed in a curved shape;
• wherein the inner circumferential surface of the cylinder is formed in a circular shape and the outer circumferential surface of the roller is formed in a circular shape;
• wherein the base circle of the rail groove and the inner circumferential surface of the circular cylinder are concentric;
• wherein a center of the base circle of the rail groove is eccentric with respect to the center of the outer circumferential surface of the roller;
• wherein a straight line that passes through the at least one vane in a direction orthogonal to the axial direction of the rotational shaft passes through the center of the outer circumferential surface of the roller;
• and
• wherein the front end surface of the at least one vane facing the inner circumferential surface of the circular cylinder and the inner circumferential surface of the circular cylinder are not in contact with each other based on shape coordinates of the base circle of the rail groove for improving leakage prevention efficiency of refrigerant and reducing noise generated by reducing the line speed.