Compressor and method of assembling compressor

Abstract

A compressor and a method of assembling the compressor are provided. The compressor includes: a shell; a motor arranged in the shell, the motor having a stator, a spacer mounted with a first bearing therein, a drive shaft supported by the first bearing and a rotor fixed onto the drive shaft; a low bearing support; a positioning member positioning the second bearing and being connected to the low bearing support; and a second bearing connected to the positioning member and/or the low bearing support and supporting the drive shaft. Furthermore, the positioning member may be removed from or maintained in the compressor after it is assembled. The present invention can avoid the adverse effects of the gravity of the rotor and the drive shaft and/or the magnetic force between the rotor and the stator on positioning the bearings and the drive shaft and can improve positioning accuracy and assembling efficiency.

What is claimed is: 
     
         1 . A compressor, comprising:
 a shell enclosed by a shell cover and a base at both ends respectively;   a motor arranged in the shell, the motor comprising:
 a stator having a stationary position relative to the shell, 
 a spacer connected to the shell and mounted with a first bearing therein, 
 a drive shaft, an end of which is supported by the first bearing, and 
 a rotor fixed onto the drive shaft and being rotatable relative to the stator; 
   a low bearing support connected fixedly to the shell or formed integrally with the shell;   a second bearing supporting the drive shaft; and   a positioning member configured to position the second bearing and connected to the low bearing support, the second bearing being connected to the positioning member and/or the low bearing support.   
     
     
         2 . The compressor according to  claim 1 , wherein the positioning member is positioned with reference to the first bearing independently of the drive shaft and the second bearing. 
     
     
         3 . The compressor according to  claim 2 , wherein the positioning member has a positioning face fitted to the second bearing. 
     
     
         4 . The compressor according to  claim 3 , wherein the positioning member has a positioning hole, and wherein the positioning face is an inner face of the positioning hole, which is fitted to an outer face of the second bearing. 
     
     
         5 . The compressor according to  claim 4 , wherein the positioning hole has a diameter greater than that of the drive shaft. 
     
     
         6 . The compressor according to  claim 4 , wherein the inner face of the positioning hole is provided with a chamfer for guiding the second bearing into the positioning hole, and wherein the outer face of the second bearing has a chamfer. 
     
     
         7 . The compressor according to  claim 4 , wherein the inner face of the positioning hole is a cylindrical face or a tapered face. 
     
     
         8 . The compressor according to  claim 1 , wherein the positioning member is a positioning ring. 
     
     
         9 . The compressor according to  claim 1 , wherein the first bearing and the second bearing are coaxial. 
     
     
         10 . The compressor according to  claim 1 , wherein the second bearing is a is thrust bearing or comprises a thrust bearing, the thrust bearing being perpendicular to a rotation axis of the drive shaft. 
     
     
         11 . The compressor according to  claim 1 , wherein the stator is provided with a flange at its outer periphery, the flange being connected to an inner wall of the shell to fix the stator to the shell. 
     
     
         12 . The compressor according to  claim 1 , wherein the compressor is a refrigeration compressor with a permanent magnet motor. 
     
     
         13 . A method of assembling a compressor, comprising:
 (a) providing a shell, a low bearing support, a positioning member, a second bearing, as well as a spacer, a stator, a drive shaft and a rotor of a motor;   (b) mounting the stator and the spacer of the motor fixedly in the shell, the spacer being mounted with a first bearing;   (c) fitting an end of the drive shaft to the first bearing and fixing the rotor onto the drive shaft;   (d) connecting the low bearing support to the shell fixedly;   (e) positioning the positioning member with reference to the first bearing and connecting the positioned positioning member to the low bearing support fixedly; and   (f) positioning the second bearing and the drive shaft with reference to the positioning member such that the first bearing and the second bearing are coaxial, and connecting the positioned second bearing to the positioning member and/or the low bearing support fixedly.   
     
     
         14 . The method according to  claim 13 , further comprising:
 (g) removing the positioning member from the low bearing support.   
     
     
         15 . The method according to  claim 13 , wherein the positioning member has a positioning face fitted to the second bearing. 
     
     
         16 . The method according to  claim 15 , wherein the positioning member has a positioning hole, and wherein the positioning face is an inner face of the positioning hole, the inner face being fitted to the outer face of the second bearing. 
     
     
         17 . The method according to  claim 16 , wherein the positioning hole has a diameter greater than that of the drive shaft, and wherein in the step (e), the positioning member is positioned after the drive shaft passes through the positioning hole, and wherein in the step (f), the second bearing is inserted between the positioning hole of the positioning member and the drive shaft such that the outer face of the second bearing is fitted to the inner face of the positioning hole and the inner face of the second bearing is fitted to the outer face of the drive shaft. 
     
     
         18 . The method according to  claim 17 , wherein the inner face of the positioning hole is provided with a chamfer for guiding the second bearing into the positioning hole, and wherein the outer face of the second bearing has a chamfer. 
     
     
         19 . The method according to  claim 14 , wherein the positioning member has a positioning face fitted to the second bearing. 
     
     
         20 . The method according to  claim 19 , wherein the positioning member has a positioning hole, and wherein the positioning face is an inner face of the positioning hole, the inner face being fitted to at least part of the outer face of the second bearing. 
     
     
         21 . The method according to  claim 20 , wherein the positioning hole has a diameter greater than that of the drive shaft, and wherein in the step (e), the positioning member is positioned after the drive shaft passes through the positioning hole, and wherein in the step (f), the second bearing is inserted between the positioning hole of the positioning member and the drive shaft such that the at least part of the outer face of the second bearing is fitted to the inner face of the positioning hole and the inner face of the second bearing is fitted to the outer face of the drive shaft. 
     
     
         22 . The method according to  claim 20 , wherein the inner face of the positioning hole is fitted to a protrusion of the outer face of the second bearing. 
     
     
         23 . The method according to  claim 20 , wherein the inner face of the positioning hole is provided with a chamfer for guiding the second bearing into the positioning hole. 
     
     
         24 . The method according to  claim 13 , wherein the second bearing is a thrust bearing or comprises a thrust bearing, and wherein in the step (f), the thrust bearing is adjusted to be perpendicular to a rotation axis of the drive shaft. 
     
     
         25 . The method according to  claim 13 , wherein in the step (e), the positioning member is positioned by means of a positioning gauge and/or a positioning clamp. 
     
     
         26 . The method according to  claim 13 , further comprising:
 enclosing the shell at both ends respectively.   
     
     
         27 . A compressor, comprising:
 a shell enclosed by a shell cover and a base at both ends respectively;   a motor arranged in the shell, the motor comprising:   a stator having a stationary position relative to the shell, a spacer connected to the shell and mounted with a first bearing therein, a drive shaft, an end of which is supported by the first bearing, and a rotor fixed onto the drive shaft and being rotatable relative to the stator;   a low bearing support connected fixedly to the shell or formed integrally with the shell; and   a second bearing being connected to the low bearing support and supporting the drive shaft, wherein the low bearing support is provided with a positioning member receiving section, which is configured to fixedly connect the low bearing support to a positioning member for positioning the second bearing during assembling the compressor.   
     
     
         28 . The compressor according to  claim 27 , wherein the positioning member receiving section is provided with connecting holes, connecting columns or connecting grooves configured to connect the positioning member during assembling the compressor. 
     
     
         29 . The compressor according to  claim 27 , wherein the at least part of the outer face of the second bearing is capable of being fitted to the positioning member. 
     
     
         30 . The compressor according to  claim 27 , wherein the outer face of the second bearing is provided with a bearing flange for connecting the second bearing to the low bearing support, a side face of which is capable of being fitted to the positioning member.