Compressor and method for assembling compressor

Abstract

A compressor includes a housing; a first scroll and a second scroll located inside the housing, the first scroll being configured to have a first end plate and a first volute extending from the first end plate towards the second scroll, the second scroll being configured to have a second end plate and a second volute extending from the second end plate towards the first scroll, the first volute and the second volute being configured to engage with each other so as to define a compression chamber therebetween; a motor including a stator and a rotor, which is located on one side of the second scroll away from the first scroll and configured for driving the first scroll to rotate by the rotor so as to drive the second scroll to rotate; a driving mechanism including a receiving hub and a flange configured to extend radially from a first end of the receiving hub and support the second end plate; wherein a second end of the receiving hub is secured to the rotor so as to position the rotor to be spaced from the stator with a certain gap between the rotor and the stator.

What is claimed is: 
     
         1 . A compressor comprising:
 a housing;   a first scroll and a second scroll located inside the housing, the first scroll being configured to have a first end plate and a first volute extending from the first end plate towards the second scroll, the second scroll being configured to have a second end plate and a second volute extending from the second end plate towards the first scroll, the first volute and the second volute being configured to engage with each other to define a compression chamber therebetween;   a motor comprising a stator and a rotor, which is located on one side of the second scroll away from the first scroll and configured for driving the first scroll to rotate by the rotor to drive the second scroll to rotate;   a driving mechanism comprising a receiving hub and a flange configured to extend radially from a first end of the receiving hub and support the second end plate;   wherein a second end of the receiving hub is secured to the rotor so as to position the rotor to be spaced from the stator with a certain gap between the rotor and the stator.   
     
     
         2 . The compressor according to  claim 1 , further comprising:
 a retainer configured to secure the rotor on it;   wherein the second end of the receiving hub is secured to the retainer on a radial inner side of the rotor to position the rotor to be spaced from the stator.   
     
     
         3 . The compressor according to  claim 2 , wherein,
 the retainer is configured to have a connecting hub and a cylindrical fixing portion, so that the rotor is secured into the fixing portion on an outer side of the connecting hub, and the second end of the receiving hub is threaded to the connecting hub on an inner side of the connecting hub.   
     
     
         4 . The compressor according to  claim 3 , further comprising:
 a rolling bearing installed on the inner side of the connecting hub of the retainer and abutted by the second end of the receiving hub against the upper side of the rolling bearing.   
     
     
         5 . The compressor according to  claim 4 , further comprising:
 a bracket secured into the housing and abutting against a lower side of the rolling bearing for supporting the retainer; and   a shaft secured to the bracket and configured to extend from the bracket into the receiving hub, the shaft being provided with a shoulder that abuts against the upper side of the rolling bearing so as to further position the rotor to be spaced from the stator.   
     
     
         6 . The compressor according to  claim 5 , wherein the bracket is provided with:
 a fixing hub into which a bottom end of the shaft is configured to extend and to be threaded;   a cylindrical receiving portion configured to receive the motor and the retainer; and   a step portion configured to be connected between the receiving portion and the fixing hub for receiving the rolling bearing, so that the lower side of the rolling bearing is abutted against a top end of the fixing hub.   
     
     
         7 . The compressor according to  claim 6 , wherein
 a top end of the shaft is located in the receiving hub and is provided with a receiving hole, and the second end plate is provided with a mounting hub extending in a direction away from the first scroll and received in the receiving hole.   
     
     
         8 . The compressor according to  claim 7 , further comprising:
 a pump comprising a top end configured to be operably connected to the mounting hub portion of the second end plate in the receiving hole and a bottom end configured to extend into an oil pool located at a bottom of the housing,   wherein the shaft is provided with a feeding passage extending from the bottom end of the shaft to the top end of the shaft, and the pump is rotatably arranged in the feeding passage so as to feed oil along a gap between the pump and the feeding passage.   
     
     
         9 . The compressor according to  claim 5 , further comprising:
 a first cover secured to the bracket so as to cover the motor, which is located between the stator and the flange and extended through by the receiving hub, wherein the stator is secured to the first cover.   
     
     
         10 . The compressor according to  claim 9 , further comprising:
 a second cover, a top of which is configured to cover and be secured to the first end plate, and a side wall of which is secured to the flange.   
     
     
         11 . The compressor according to  claim 9 , wherein the rotor is located on a side of the stator facing away from the first cover. 
     
     
         12 . The compressor according to  claim 7 , wherein
 a central axis of the receiving hole of the shaft is collinear with a rotational axis of the second scroll, a central axis of the top end of the shaft is collinear with a rotational axis of the first scroll, and the central axis of the receiving hole is deviated from the central axis of the top end of the shaft, so that the rotational axis of the second scroll is deviated from the rotational axis of the first scroll.   
     
     
         13 . (canceled) 
     
     
         14 . A method of assembling a compressor comprising a housing, a bracket with a fixing hub, a motor with a stator and rotor, a retainer with a connecting hub, a rolling bearing, and a driving mechanism with a receiving hub, wherein the method comprises:
 securing the bracket in the housing;   mounting the rolling bearing on an inner side of the connecting hub of the retainer;   mounting the retainer mounted with the rotor onto the bracket rotatably and securing the stator onto the bracket, wherein the stator and the rotor are attracted to each other together due to a magnetic attraction between the stator and the rotor; and   the driving mechanism is mounted on the retainer by threading the receiving hub of the driving mechanism to the connecting hub of the retainer, so that one end of the receiving hub is pushed against an upper side of the rolling bearing in a direction away from the stator, driving the retainer and the rotor to move together in the direction away from the stator, thereby positioning the rotor to be spaced apart from the stator.   
     
     
         15 . The method according to  claim 14 , wherein the compressor further comprises a shaft with a shoulder, and the method further comprises:
 mounting the shaft onto the bracket, wherein a bottom end of the shaft is secured into the fixing hub of the bracket, so that the shoulder of the shaft is pushed against the upper side of the rolling bearing in the direction away from the stator, until a lower side of the rolling bearing is abutted against a top end of the fixing hub of the bracket, thereby further maintaining a gap between the rotor and the stator.   
     
     
         16 . The method according to  claim 14 , wherein the compressor further comprises a first cover, wherein the step of securing the stator onto the bracket comprises securing the stator onto the first cover, and then securing the first cover onto the bracket.