Vane rotary compressor with pressure reducing member inserted into the oil supply passage

A vane rotary compressor, comprising:

• a casing;
• a cylinder provided in an inner space of the casing;
• a plurality of bearings forming a compression space together with the cylinder, and provided with a plurality of back pressure pockets each having a different pressure formed on a surface facing the cylinder;
• a rotational shaft radially supported by the plurality of bearings;
• a roller eccentrically inserted into the cylinder so that an outer circumferential surface of the roller has one contact point closest to an inner circumferential surface of the cylinder, wherein the roller is provided with a plurality of vane slots formed along a circumferential direction;
• and
• a plurality of vanes slidably inserted into the plurality of vane slots of the roller, respectively, and configured to divide the compression space into a plurality of compression chambers, respectively, wherein at least one of the plurality of bearings is provided with an oil supply passage that provides communication between a space between an outer circumferential surface of the rotational shaft and an inner circumferential surface of the at least one of the plurality of bearings facing the outer circumferential surface of the rotational shaft and the plurality of back pressure pockets of the at least one of the plurality of bearings, wherein the oil supply passage communicates with a back pressure pocket having a relatively low pressure among the plurality of back pressure pockets, and wherein the oil supply passage includes a third oil supply hole that axially penetrates the cylinder, and a fourth oil supply hole that radially penetrates a flange portion of the at least one of the plurality of bearings so that the oil supply passage passes through an outer circumferential surface of the back pressure pocket and is directly connected to the back pressure pocket.

A vane rotary compressor, comprising:

• a casing;
• a cylinder provided in an inner space of the casing;
• a main bearing and a sub bearing forming a compression space together with the cylinder, and provided with a plurality of back pressure pockets each having a different pressure formed on a surface facing the cylinder;
• a rotational shaft radially supported by the main bearing and the sub bearing;
• a roller eccentrically inserted into the cylinder so that an outer circumferential surface of the roller has one contact point closest to an inner circumferential surface of the cylinder, wherein the roller is provided with a plurality of vane slots formed along a circumferential direction, each vane slot having a first end opened toward an outer circumferential surface;
• and
• a plurality of vanes slidably inserted into the plurality of vane slots of the roller, respectively, and configured to divide the compression space into a plurality of compression chambers, respectively, wherein at least one of the main bearing or the sub bearing is provided with an oil supply passage that provides communication between a space between an outer circumferential surface of the rotational shaft and an inner circumferential surface of the main bearing facing the outer circumferential surface of the rotational shaft and the plurality of back pressure pockets of the main bearing, or a space between the outer circumferential surface of the rotational shaft and an inner circumferential surface of the sub bearing facing the outer circumferential surface of the rotational shaft and the plurality of back pressure pockets of the sub bearing, wherein the oil supply passage communicates with a back pressure pocket having a relatively low pressure among the plurality of back pressure pockets, wherein each of the main bearing and the sub bearing is provided with a flange that extends therefrom and forms the compression space together with the cylinder, and wherein the oil supply passage extends through each of the flange of the main bearing, the cylinder, and the flange of the sub bearing so that the oil supply passage passes through an outer circumferential surface of the back pressure pocket and is directly connected to the back pressure pocket.