Hermetic compressor

A hermetic compressor, comprising:

• a cylinder, an inner circumference of which is circular and forms a compression chamber, wherein an intake port and at least one exhaust port are formed on the inner circumference of the cylinder;
• a roller that is eccentric to the inner circumference of the cylinder and varies a volume of the compression chamber while rotating;
• and
• a plurality of vanes that is inserted into the roller, rotates with the roller, and is pushed out toward the inner circumference of the cylinder by rotation of the roller to divide the compression chamber into a plurality of spaces, wherein, when a point at which the inner circumference of the cylinder and an outer circumference of the roller are closest is referred to as a contact point and a line passing through the contact point and a center of the cylinder is referred to as a centerline, a non-contact region in which the inner circumference of the cylinder and a sealing surface of a vane of the plurality of vanes are separated is created in a region comprising the at least one exhaust port with respect to the centerline;
• and
• a plurality of swing bushings rotatably attached to the roller, wherein a vane body of each of the plurality of vanes is slidably attached to a respective swing bushing of the plurality of swing bushings so that the vane slides in and out of the roller, wherein each of the plurality of vanes comprises:
• the vane body inserted into the roller;
• and
• a guide portion that extends from an axial end of the vane body in a direction crossing a direction in which the vane slides out of the roller, wherein the guide portion includes a first guide portion and a second guide portion which extend to either side, respectively, with respect to the vane body, and wherein a circumferential length of the second guide portion is longer than a circumferential length of the first guide portion with respect to a rotational direction of the roller so that a back pressure against a gas pressure in the compression chamber is applied on the second guide portion with respect to a longitudinal centerline of the vane body.

A hermetic compressor, comprising:

• a cylinder, an inner circumference of which is elliptical and forms a compression chamber;
• a first bearing and a second bearing provided on both sides of the cylinder and forming a compression chamber together with the cylinder;
• a roller that is attached to a rotary shaft supported by the first and second bearings, eccentric to the inner circumference of the cylinder, and varies a volume of the compression chamber while rotating;
• a guide groove formed on a surface of one of the first bearing or the second bearing facing the roller;
• a plurality of vanes that is inserted into the roller, rotates with the roller, and is pushed out toward the inner circumference of the cylinder by rotation of the roller to divide the compression chamber into a plurality of spaces;
• and
• a plurality of swing bushings rotatably attached to the roller, wherein a vane body of each of the plurality of vanes is slidably attached to a respective swing bushing of the plurality of swing bushings so that the vane slides in and out of the roller, wherein each of the plurality of vanes comprises:
• the vane body inserted into the roller and having a sealing surface that contacts the inner circumference of the cylinder;
• and
• a guide portion that extends from the vane body in a direction perpendicular to a direction of sliding movement of the vane, wherein the guide portion is slidably inserted into the guide groove to restrain the vane from sliding out of the roller toward the inner circumference of the cylinder, wherein the vane body is eccentric to a rear with respect to a moving direction of the vane from a circumferential center of the guide portion, and wherein a point of application of a back pressure against a gas pressure in the compression chamber is formed in a direction of application of gas pressure with respect to a longitudinal centerline of the vane body.