Scroll compressor

Abstract

A scroll compressor includes a first scroll and a second scroll. The first scroll has a step portion that separates an elevated portion and a recessed portion of a surface of the first scroll. A spiral wall of the second scroll has a step that separates an elevated portion and a recessed portion of the wall. A first bypass hole is provided in the elevated portion of the surface of the first scroll. A second bypass hole is provided in the recessed portion of the surface of the first scroll. The second bypass hole is within 360 degrees toward a center of the spiral of the first scroll from an outer end of the spiral. The first bypass hole is within 360 degrees from the second bypass hole toward the center of the spiral.

1 . A scroll compressor comprising: 
 a first scroll that includes a first plate having a surface and a first wall fixed in a spiral manner on the surface of the first plate;    a second scroll that includes a second plate having a surface and a second wall fixed in a spiral manner on the surface of the second plate, wherein the first wall of the first scroll and the second wall of the second scroll engage with each other thereby forming a plurality of compression chambers, and the first scroll and the second scroll rotate relative to each other;    the surface of the first plate having a first bottom portion and a second bottom portion and the first bottom portion and the second bottom portion are separated by a first bottom step, wherein the first bottom portion is positioned inside a first spiral formed by the first wall and near a center of the first spiral, the first bottom portion is elevated in a direction of height of the first wall, the second bottom portion is positioned inside the first spiral and on an outer end of the first spiral, and the second bottom portion is recessed in the direction of the height of the first wall;    the second wall of the second scroll having a first wall portion and a second wall portion and the first wall portion and the second wall portion are separated by a first wall step, wherein the first wall portion is positioned on a free end of the second wall and near a center of a second spiral formed by the second wall, the first wall portion is recessed in a direction of height of the second wall, the second wall portion is positioned on the free end of the second wall and on an outer end of the second spiral, and the second wall portion is elevated in the direction of the height of the second wall, and at one particular point the first bottom step abutting with the first wall step when the first scroll and the second scroll rotate relative to each other; and    a bypass hole in the first bottom portion and that lets a compression chamber among the compression chambers to communicate with outside.    
   
   
       2 . The scroll compressor according to  claim 1 , wherein 
 the surface of the second plate having a third bottom portion and a fourth bottom portion and the third bottom portion and the fourth bottom portion are separated by a second bottom step, wherein the third bottom portion is positioned inside the second spiral and near a center of the second spiral, the third bottom portion is elevated in a direction of height of the second wall, the fourth bottom portion is positioned inside the second spiral and on an outer end of the second spiral, and the fourth bottom portion is recessed in the direction of the height of the second wall;    the first wall of the first scroll having a third wall portion and a fourth wall portion and the third wall portion and the fourth wall portion are separated by a second wall step, wherein the third wall portion is positioned on a free end of the first wall and near a center of the first spiral, the first wall portion is recessed in a direction of height of the first wall, the fourth wall portion is positioned on the free end of the first wall and on an outer end of the first spiral, and the fourth wall portion is elevated in the direction of the height of the first wall, and at one particular point the second bottom step abutting with the second wall step when the first scroll and the second scroll rotate relative to each other; and    the first bottom portion having a second bypass hole at substantially 180 degrees from the bypass hole toward the center of the first spiral or toward the outer end of the first spiral, and that lets a different compression chamber among the compression chambers to communicate with outside.    
   
   
       3 . The scroll compressor according to  claim 1 , wherein 
 the second bottom portion having a third bypass hole that lets a different compression chamber among the compression chambers to communicate with outside.    
   
   
       4 . The scroll compressor according to  claim 3 , wherein 
 the third bypass hole is within 360 degrees from the outer end of the first spiral toward the center of the first spiral, and the bypass hole is within 360 degrees from the third bypass hole toward the center of the first spiral.    
   
   
       5 . The scroll compressor according to  claim 4 , wherein the third bypass holes are provided in plurality.  
   
   
       6 . The scroll compressor according to  claim 3 , wherein 
 the second bottom portion having a fourth bypass hole at substantially 180 degrees from the third bypass hole toward the center of the first spiral, and that lets a different compression chamber among the compression chambers to communicate with outside.    
   
   
       7 . The scroll compressor according to  claim 4 , wherein the fourth bypass holes are provided in plurality.  
   
   
       8 . The scroll compressor according to  claim 4 , wherein the bypass hole, the second bypass hole, the third bypass hole, and the fourth bypass hope are substantially circular.  
   
   
       9 . The scroll compressor according to  claim 4 , wherein a portion of the bypass hole, the second bypass hole, the third bypass hole, and the fourth bypass, hope is covered with the first wall.