Hermetic compressor with cylinder having elliptical inner circumferential surface, roller, and at least one vane

Abstract

A hermetic compressor may include a cylinder having an elliptical inner circumferential surface; a roller eccentric from the inner circumferential surface; and at least one vane withdrawn towards the inner circumferential surface when the roller is rotated to divide a compression chamber space into compression chambers. On the basis of A first center line passes through a contact reference point where the inner circumferential surface of the cylinder and an outer circumferential surface of the roller are closest, a first center line passes and through a lateral center of an inner space of the cylinder, an . A first pair of ellipse segments are positioned at a first side of the first center line and forming form portions of the inner circumferential surfaceis a first ellipse, a . A center point of the first pair of ellipse segments is a first center point, an . A second pair of ellipse segments are positioned at a second side of the first center line and forming form portions of the inner circumferential surface is a second ellipse, a . A center point of the second pair of ellipse segments is a second center point, and the first center point and the second center point are spaced apart from the lateral center of the inner space of the cylinder.

What is claimed is: 
     
         1 . A hermetic compressor, comprising:
 a cylinder having an inner circumferential surface, which forms bounds a compression chamber, formed in an elliptical shape space within the cylinder;   a roller provided to be eccentric from the inner circumferential surface of the cylinder, and configured to change a volume of the compression chamber by being rotated; and   at least one vane formed to be withdrawn towards the inner circumferential surface of the cylinder when the roller is rotated, and configured to divide the compression chamber space into a plurality of spaces compression chambers, wherein rotation of the roller and the at least one vane causes volumes of the plurality of compression chambers to change, wherein on the basis of with respect to a contact reference point where the inner circumferential surface of the cylinder and an outer circumferential surface of the roller are closest to each other, and a first center line passing through a lateral center of an inner space of the cylinder and the reference point, an a first pair of ellipse segments are positioned at a first side of the first center line and forming form respective portions of the inner circumferential surface of the cylinder is defined as a first ellipse, a center point of the first pair of ellipse segments is defined as a first center point, an a second pair of ellipse segments are positioned at a second side of the first center line and forming form respective portions of the inner circumferential surface of the cylinder is defined as a second ellipse, and a center point of the second pair of ellipse segments is defined as a second center point, the first center point and the second center point are spaced apart from the lateral center of the inner space of the cylinder, wherein the first center point and the second center point are positioned on the first center line, at different separation distances from the lateral center of the inner space of the cylinder, and wherein the first center point and the second center point are positioned on a same side, on the basis of a second center line passing through the lateral center of the inner space of the cylinder and perpendicular to the first center line.   
     
     
         2 . The hermetic compressor of  claim 1 , wherein the first center point is farther from the lateral center of the inner space of the cylinder than the second center point. 
     
     
         3 . The hermetic compressor of  claim 1 , wherein the first pair of ellipse segments is formed as two ellipses having a same sum of distances to two focal points for every point thereonellipse segments , and wherein an ellipse segment of the two ellipsesellipse segments positioned at a relatively short distance from the contactreference point thancompared to an ellipse segment of the two ellipsesellipse segments positioned at a relatively long distance from the contactreference point is formed such that a distance between two focal points thereon ishas a relatively largelarger eccentricity. 
     
     
         4 . The hermetic compressor of  claim 1 , wherein the second pair of ellipse segments is formed as two ellipses having a same sum of distances to two focal points for every point thereonellipse segments, and wherein an ellipse segment of the two ellipsesellipse segments positioned at a relatively short distance from the contactreference point thancompared to an ellipse segment of the two ellipses ellipse segments positioned at a relatively long distance from the contact reference point is formed such that a distance between two focal points thereon is has a relatively large larger eccentricity. 
     
     
         5 . The hermetic compressor of  claim 1 , wherein each of the first pair of ellipse segments and the second pair of ellipse segments is formed as two ellipses having a same sum of distances to two focal points for every point thereonellipse segments, wherein one of the ellipse segments of the first pair of ellipse segments positioned at a relatively short distance from the contactreference point thancompared to another of the ellipse segments of the first pair of ellipse segments positioned at a relatively long distance from the contactreference point is formed such that a distance between two focal points thereon ishas a relatively largelarger eccentricity, and wherein one of the ellipse segments of the second pair of ellipse segments positioned at a relatively short distance from the contactreference point thancompared to another of the ellipse segments of the second pair of ellipse segments positioned at a relatively long distance from the contactreference point is formed such that a distance between two focal points thereon ishas a relatively largelarger eccentricity. 
     
     
         6 . The hermetic compressor of  claim 1 , wherein a line passing through the first center point in a direction perpendicular to the first center line is defined as a third center line, and a line passing through the second center point in a direction perpendicular to the first center line is defined as a fourth center line, a region of the first pair of ellipse segments is divided into first and second quadrants in a rotational direction of the roller by the first and third center lines such that the first pair of ellipse segments includes a first ellipse segment in the first quadrant and a second ellipse segment in the second quadrant, and a region of the second pair ellipse segments is divided into third and fourth quadrants by the first and fourth center lines such that the first pair of ellipse segments includes a first ellipse segment in the first quadrant and a second ellipse segment in the second quadrant, and wherein each ellipse segment of the ellipsesellipse segments in the four quadrants are formed to havehas a different distances between two focal points thereofeccentricity. 
     
     
         7 . The hermetic compressor of  claim 6 , wherein the contactreference point is included in the first quadrant on the basis of the third center line, and wherein a distance between two focal pointsan eccentricity of anthe first ellipse segment in the first quadrant including the contact point is formed to be larger than a distance between two focal points an eccentricity of an  the third ellipse segment in the second quadrant. 
     
     
         8 . The hermetic compressor of  claim 6 , wherein the contactreference point is included in the fourth quadrant on the basis of the fourth center line, and wherein a distance between two focal pointsan eccentricity of anthe fourth ellipse segment in the fourth quadrant including the contact point is formed to be larger than a distance between two focal points of an ellipse in the third quadrant. 
     
     
         9 . The hermetic compressor of  claim 1 , wherein a section having a same curvature radius as the roller is formed at a sealing section including the contactreference point along the inner circumferential surface of the cylinder. 
     
     
         10 . A hermetic compressor, comprising:
 a cylinder having an inner circumferential surface, which forms bounds a compression chamber formed in an elliptical shape space within the cylinder;   a roller provided to be eccentric from the inner circumferential surface of the cylinder, and configured to change a volume of the compression chamber by being be rotated; and   at least one vane formed to be withdrawn towards the inner circumferential surface of the cylinder when the roller is rotated, and configured to divide the compression chamber space into a plurality of spaces compression chambers, wherein rotation of the roller and the at least one vane causes volumes of the plurality of compression chambers to changeswherein a position where the inner circumferential surface of the cylinder and an outer circumferential surface of the roller are closest to each other is at a contact reference point, a line passing through the contact reference point and a lateral center of an inner space of the cylinder is a first center line, a line perpendicular to the first center and passing through the lateral center of the inner space of the cylinder is a second center line, and lines perpendicular to the first center line and passing through a first center pint point and a second center point are third and fourth center lines, the inner circumferential surface of the cylinder is divided into four quadrants and in each of the four quadrants the inner circumferential surface of the cylinder is in the shape of a different partial ellipse, wherein each of a first and second pair of partial ellipses formed above and below the first center line  include two includes first and second partial ellipses having a same sum of distances to two focal points for every point thereon the first center point, wherein a second pair of partial ellipses formed below the first center line includes third and fourth partial ellipses having the second center point, wherein the first partial ellipse is positioned at a relatively short distance from the contact reference point than compared to the first second partial ellipse which is positioned at a relatively long distance from the contact reference point is formed such that a distance between two focal points thereon , wherein an eccentricity of the first partial ellipse is relatively large, and wherein the second fourth partial ellipse is positioned at a relatively short distance from the contact reference point than compared to the second third partial ellipse which is positioned at a relatively long distance from the contact reference point is formed such that a distance between two focal points thereon , and wherein an eccentricity of the fourth partial ellipse is relatively large.   
     
     
         11 . The hemetic compressor of  claim 10 , where a region of the first pair of partial ellipseellipses is divided into first and second quadrants in a rotational direction of the roller by the first and secondthird center lines, and a region of the second ellipsepair of partial ellipses is divided into third and fourth quadrants by the first and thirdfourth center lines, and wherein theeach partial ellipsesellipse in the four quadrants are formed to havehas a different distances between two focal points thereoneccentricity. 
     
     
         12 . The hermetic compressor of  claim 10 , wherein a section having a same curvature radius as the roller is formed at a sealing section including the contactreference point along the inner circumferential surface of the cylinder. 
     
     
       13. A hermetic compressor, comprising:
 a cylinder having an inner circumferential surface, which bounds a compression space within the cylinder;   a roller provided to be eccentric from the inner circumferential surface of the cylinder; and configured to be rotated; and   at least one vane formed to be withdrawn towards the inner circumferential surface of the cylinder when the roller is rotated, and configured to divide the compression space into a plurality of compression chambers, wherein rotation of the roller and the at least one vane causes volumes of the pluraligz of compression chambers to change, wherein the inner circumferential surface of the cylinder and an outer circumferential surface of the roller are closest to each other at a reference point, a line passing through the reference point and a lateral center of an inner space of the cylinder is a first center line, and a line perpendicular to the first center line and passing through the lateral center of the inner space of the cylinder is a second center line, the inner circumferential surface of the cylinder is divided into four quadrants and in each of the four quadrants the inner circumferential surface of the cylinder is in the shape of a different partial ellipse, wherein a first partial ellipse and a second partial ellipse are formed at a first side with respect to the first center line and a third partial ellipse and a fourth partial ellipse are formed at a second side with respect to the first center line, wherein the first partial ellipse is positioned at a relatively short distance from the reference point compared to the second partial ellipse which is positioned at a relatively long distance from the reference point. wherein an eccentricity of the first partial ellipse is relatively large, wherein the fourth partial ellipse is positioned at a relatively short distance from the reference point compared to the third partial ellipse which is positioned at a relatively long distance from the reference point, and wherein an eccentricigz of the fourth partial ellipse is relatively large.   
     
     
       14. The hermetic compressor of  claim 13 , wherein an eccentricity of each of the first to fourth partial ellipses is different than an eccentricity of the other partial ellipses. 
     
     
       15. The hermetic compressor of  claim 13 , wherein a section having a same curvature radius as the roller is formed at a sealing section including the reference point along the inner circumferential surface of the cylinder.