Compressor

Abstract

A compressor including a shell; a first scroll and a second scroll positioned in the shell, the first scroll having a first end plate and a first wrap extending from the first end plate toward the second scroll, the second scroll having a second end plate and a second wrap extending from the second end plate toward the first scroll, the first wrap and the second wrap being engaged with each other to define a compression chamber therebetween, the second end plate of the second scroll further having a mounting hub portion extending in a direction away from the first scroll; a driving mechanism positioned on a side of the second scroll away from the first scroll in the shell and configured for driving the first scroll to rotate about a first rotation center, such that the first scroll drives the second scroll to rotate about a second rotation center; and a shaft positioned in the shell and fixedly mounted in the compressor, one end of the shaft being provided with a first hole in which the mounting hub portion is accommodated.

1 . A compressor, comprising:
 a shell;   first and second scrolls positioned in the shell, the first scroll having a first end plate and a first wrap extending from the first end plate toward the second scroll, the second scroll having a second end plate and a second wrap extending from the second end plate toward the first scroll, the first wrap and the second wrap being engaged with each other to define a compression chamber therebetween, the second end plate of the second scroll further having a mounting hub portion extending in a direction away from the first scroll;   a driving mechanism positioned on a side of the second scroll away from the first scroll in the shell, and configured for driving the first scroll to rotate about a first rotation center, such that the first scroll drives the second scroll to rotate about a second rotation center; and   a shaft positioned in the shell and fixedly mounted in the compressor, one end of the shaft being provided with a first hole in which the mounting hub portion is accommodated.   
     
     
         2 . The compressor according to  claim 1 , further comprising:
 a first sleeve being accommodated in the first hole and configured for accommodating the mounting hub portion therein.   
     
     
         3 . The compressor according to  claim 2 , further comprising:
 a first bearing provided between the first sleeve and the mounting hub portion, wherein an outer diameter of the first sleeve is smaller than an inner diameter of the first hole.   
     
     
         4 . The compressor according to  claim 2 , wherein:
 the shaft is further provided with a second hole positioned in a side wall of the first hole and communicating with the first hole;   an outer wall of the first sleeve is provided with a driving part in a radial direction; and the second hole is fitted with the driving part.   
     
     
         5 . The compressor according to  claim 4 , further comprising:
 a pin accommodated in the second hole; wherein the driving part of the first sleeve is a driving surface for abutting against the pin.   
     
     
         6 . The compressor according to  claim 4 , wherein:
 the driving part of the first sleeve is a protrusion extending outward in the radial direction of the first sleeve and configured for fitting into the second hole.   
     
     
         7 . The compressor according to  claim 5 , wherein: the driving surface is flat or has a curved shape. 
     
     
         8 . The compressor according to  claim 4 , wherein:
 the rotation center of the first scroll and the rotation center of the second scroll do not coincide with each other in an axial direction.   
     
     
         9 . The compressor according to  claim 8 , wherein:
 the shaft is further provided with a passage, which is in fluid communication with the first hole and configured for accommodating a pump rod and supplying oil pumped by the pump rod, one end of the pump rod is positioned in an oil sump at the bottom of the shell, the other end of the pump rod is connected to the mounting hub portion, wherein a cross section of the passage has an inner diameter smaller than the inner diameter of the first hole.   
     
     
         10 . The compressor according to  claim 9 , wherein:
 a first geometric center corresponding to an outer diameter of the side wall of the first hole coincides with the rotation center of the first scroll in the axial direction, and a second geometric center corresponding to an inner diameter of the cross section of the passage coincides with the rotation center of the second scroll in the axial direction.   
     
     
         11 . The compressor according to  claim 10 , wherein:
 a circumferential position of the second hole along the side wall of the shaft is determined by an angle between a line connecting the second hole and the second geometric center and a line connecting the first geometric center and the second geometric center.   
     
     
         12 . The compressor according to  claim 9 , wherein:
 the shaft is further provided with a third hole positioned in the side wall of the shaft and extending axially from a top of the side wall to the oil sump and a fourth hole positioned in the side wall of the shaft and extending radially from the first hole to the outside of the side wall.   
     
     
         13 . The compressor according to  claim 1 , further comprising:
 a frame fixed to the shell at the side of the second scroll away from the first scroll;   wherein the shaft is fixed to the frame.   
     
     
         14 . The compressor according to  claim 13 , wherein:
 the driving mechanism comprises:   an accommodating hub portion comprising opposite first and second ends and being rotatably mounted on the shaft so that the driving mechanism is rotatably mounted onto the frame; and   a first flange portion radially extending outward from the first end,   wherein the driving mechanism is provided with an inner hole extending through the accommodating hub portion and the first flange portion, and is connected with the first scroll through the first flange portion, and wherein the second end plate of the second scroll is rotatably supported on the first flange portion.   
     
     
         15 . The compressor according to  claim 14 , further comprising:
 a second bearing through which the first end is mounted on the shaft; and   a third bearing through which the second end is mounted on the shaft.   
     
     
         16 . The compressor according to  claim 14 , wherein:
 the shaft has a first step portion,   a hole wall of the inner hole of the accommodating hub portion has a second step portion facing the first step portion, and   the scroll compressor further comprises a fourth bearing provided between the first step portion and the second step portion.   
     
     
         17 . The scroll compressor according to  claim 14 , wherein:
 the frame comprises: a second sleeve and a second flange portion radially extending from the second sleeve of the frame, and the second end is supported on the second flange portion of the frame.   
     
     
         18 . The scroll compressor according to  claim 17 , wherein:
 the shaft is accommodated in the accommodating hub portion, such that one end of the shaft being provided with the first hole is flush with an upper surface of the first flange portion and the other end of the shaft extends out of the accommodating hub portion so as to be inserted and fixed in the second sleeve of the frame.   
     
     
         19 . The compressor according to  claim 14 , further comprising:
 a motor comprising: a stator fixed to the frame, and a rotor connected to the accommodating hub portion of the driving mechanism by interference fit, so as to drive the driving mechanism and thus the first scroll to rotate.   
     
     
         20 . The compressor according to  claim 15 , further comprising:
 a bushing positioned between the side wall of the inner hole of the first flange portion and the outer wall of the first hole of the shaft, the second bearing being provided inside the bushing.   
     
     
         21 . The compressor according to  claim 20 , wherein the bushing comprises:
 a cylindrical body, and   a fixing portion provided on an outer circumferential surface of the cylindrical body and fitted with the side wall of the inner hole of the first flange portion.   
     
     
         22 . The compressor according to  claim 19 , wherein:
 the motor is an axial-flux motor.   
     
     
         23 . The compressor according to  claim 2 , wherein:
 the first sleeve is made of at least one of a sintered material, a metallic material and a composite material.   
     
     
         24 . The compressor according to  claim 2 , wherein:
 the first sleeve has a Rockwell hardness of greater than or equal to 15.   
     
     
         25 . The compressor according to  claim 20 , wherein:
 the bushing has a Rockwell hardness of greater than or equal to 15.