Scroll compressor

Abstract

A scroll compressor includes a shell, a main frame, a fixed scroll, an orbiting scroll, and a crankshaft. The main frame has a suction port for supplying the inside of a compression chamber with the refrigerant swirling around the crankshaft in a lower space below the main frame. The suction port is formed so as to be tilted relative to the axial direction of the crankshaft while running in the direction in which refrigerant flows from the lower space below the main frame to the upper space above the main frame.

The invention claimed is: 
     
         1 . A scroll compressor comprising:
 a shell forming a sealed space;   a suction pipe connected to the shell;   a main frame fixed to an inner wall surface of the shell;   a fixed scroll including a first base plate provided with a first scroll body;   an orbiting scroll supported by the main frame so as to orbit around the fixed scroll, the orbiting scroll including a second base plate provided with a second scroll body meshing with the first scroll body, the orbiting scroll forming, with the fixed scroll, a compression chamber in which refrigerant is compressed; and   a crankshaft transmitting rotational driving force to the orbiting scroll, wherein   the main frame has a suction port for supplying an inside of the compression chamber with refrigerant flowing from the suction pipe into the shell and swirling around the crankshaft in a lower space below the main frame, and   the suction port is formed so as to be tilted relative to an axial direction of the crankshaft while running in a direction in which refrigerant flows from the lower space below the main frame to an upper space above the main frame.   
     
     
         2 . The scroll compressor of  claim 1 , wherein
 an outer peripheral wall of the main frame has a recessed part allowing the lower space below the main frame and the upper space above the main frame to communicate with each other and formed circumferentially along the main frame, and   the suction port is surrounded by the recessed part and the inner wall surface of the shell.   
     
     
         3 . The scroll compressor of  claim 1 , wherein
 an inlet and an outlet of the suction port are displaced in a circumferential direction of the main frame.   
     
     
         4 . The scroll compressor of  claim 1 , wherein
 the suction port is formed so as to be tilted according to a rotation direction of the crankshaft.   
     
     
         5 . The scroll compressor of  claim 1 , wherein
 an outlet of the suction port is formed at one or both of a position apart from an outer end portion of the first scroll body, with an intersection point of a line extended from the outer end portion of the first scroll body toward an outer peripheral edge of the main frame and the outer peripheral edge of the main frame as an origin, and a position apart from an outer end portion of the second scroll body, with an intersection point of a line extended from the outer end portion of the second scroll body toward the outer peripheral edge of the main frame and the outer peripheral edge of the main frame as an origin.   
     
     
         6 . The scroll compressor of  claim 1 , wherein
 the scroll compressor comprises a plurality of the suction ports including a main port and a sub-port having an opening area smaller than the main port.   
     
     
         7 . The scroll compressor of  claim 6 , further comprising:
 a suction pipe that is connected to the shell and through which refrigerant is sucked inside from outside the shell, wherein   the sub-port is formed at a position closer to the suction pipe than the main port.   
     
     
         8 . The scroll compressor of  claim 7 , wherein
 the main frame includes, in a center portion, a bearing part supporting the crankshaft,   the main port is formed at a position where the main port faces the suction pipe with the bearing part interposed therebetween, and   the sub-port is formed circumferentially along the main frame, at a position midway between the main port and the bearing part.   
     
     
         9 . The scroll compressor of  claim 1 , wherein
 the shell has a step part protruding from the inner wall surface in a radial direction and supporting the main frame, and   an inlet of the suction port is formed larger than an outlet of the suction port in the radial direction by a dimension of the step part protruding in the radial direction.   
     
     
         10 . The scroll compressor of  claim 1 , wherein
 an inner wall surface of the suction port has a fine uneven shape.   
     
     
         11 . The scroll compressor of  claim 10 , wherein
 the inner wall surface of the suction port has a surface roughness greater than or equal to a casting surface or a surface finished by medium-grade machining.