Rotary compressor

A rotary compressor, comprising:

• a cylinder, an inner peripheral surface of which is defined in an annular shape to define a compression space, provided with a suction port configured to communicate with the compression space to suction and provide refrigerant to the compression space;
• a roller rotatably provided in the compression space of the cylinder, and including with a plurality of vane slots provided at predetermined intervals along an outer peripheral surface, the plurality of vane slots each providing a back pressure at one side thereinside;
• a plurality of vanes slidably inserted into the plurality of vane slots, respectively, to rotate together with the roller, wherein front end surfaces of the plurality of vanes come into contact with an inner peripheral surface of the cylinder due to the back pressure to partition the compression space into a plurality of compression chambers;
• and
• a main bearing and a sub bearing provided at both ends of the cylinder, respectively, and spaced apart from each other to define surfaces of the compression space, respectively, wherein an intermediate back pressure pocket configured to communicate with one side of the plurality of vane slots so as to provide the back pressure at an intermediate pressure is provided in at least one of the main bearing or the sub bearing, wherein a pressure supply passage that provides communication between the compression space and the intermediate back pressure pocket is disposed in the at least one of the main bearing or the sub bearing, wherein the pressure supply passage comprises:
• a first passage concavely disposed on a surface of the at least one of the sub bearing or the main bearing, one side of which communicates with the compression space to receive a pressure from the compression space;
• and
• a second passage disposed to pass through the surface of the at least one of the sub bearing or the main bearing so as to communicate with the first passage to provide the pressure provided from the first passage to the intermediate back pressure pocket, wherein the cylinder is provided with a microseism reduction chamber having a space of a predetermined volume to communicate with the intermediate back pressure pocket so as to reduce a microseism of a pressure of the compression space, and wherein the pressure supply passage further comprises:
• a fourth passage that allows the microseism reduction chamber and the intermediate back pressure pocket to communicate with each other, a first side of which is provided on the surface of at least one of the sub bearing or the main bearing, and a second side of which is connected to the second passage, wherein the second passage comprises:
• a first hole that passes from the surface of at least one of the sub bearing or the main bearing toward an inside thereof;
• and
• a second hole that intersects the first hole, a first side of which communicates with the first hole, and a second side of which communicates with the intermediate back pressure pocket, and wherein a first side of the first hole provided on the surface of at least one of the sub bearing or the main bearing is spaced apart from the first passage.

A rotary compressor, comprising:

• a cylinder, an inner peripheral surface of which is defined in an annular shape to define a compression space, provided with a suction port configured to communicate with the compression space to suction and provide refrigerant to the compression space;
• a roller rotatably provided in the compression space of the cylinder, and including with a plurality of vane slots provided at predetermined intervals along an outer peripheral surface, the plurality of vane slots each providing a back pressure at one side thereinside;
• a plurality of vanes slidably inserted into the plurality of vane slots, respectively, to rotate together with the roller, wherein front end surfaces of the plurality of vanes come into contact with an inner peripheral surface of the cylinder due to the back pressure to partition the compression space into a plurality of compression chambers;
• and
• a main bearing and a sub bearing provided at both ends of the cylinder, respectively, and spaced apart from each other to define surfaces of the compression space, respectively, wherein an intermediate back pressure pocket configured to communicate with one side of the plurality of vane slots so as to provide the back pressure at an intermediate pressure is provided in at least one of the main bearing or the sub bearing, and wherein a pressure supply passage that provides communication between the compression space and the intermediate back pressure pocket is disposed in the at least one of the main bearing or the sub bearing, wherein the pressure supply passage comprises:
• a first passage concavely disposed on a surface of the at least one of the sub bearing or the main bearing, one side of which communicates with the compression space to receive a pressure from the compression space;
• and
• a second passage disposed to pass through the surface of the at least one of the sub bearing or the main bearing so as to communicate with the first passage to provide the pressure provided from the first passage to the intermediate back pressure pocket, and wherein the second passage comprises:
• a first hole that passes through the surface of at least one of the sub bearing or the main bearing toward an inside thereof;
• a second hole spaced apart from the first hole to be parallel thereto, one side of which communicates with the intermediate back pressure pocket;
• and
• a third hole disposed to intersect the first hole and the second hole, respectively, so as to provide communication between the first hole and the second hole.