Compressor Bearing Assembly for Accurate Coaxial Positioning
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Solution Overview
Problem
Conventional compressor assembly methods face challenges in accurately positioning bearings due to the adverse effects of gravity and magnetic forces, leading to inefficiencies and positioning errors.
Innovation Solution
A compressor design and assembly method that separates the coaxial positioning of bearings from the movement of the drive shaft, using a positioning member to independently position the second bearing relative to the first bearing, thereby avoiding the interference of gravity and magnetic forces, and utilizing a chamfered positioning hole for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If one bearing is fixed and the other bearing is adjusted to achieve coaxial positioning, then the bearing alignment can be achieved, but a very large force is necessary which causes positioning errors and low positioning efficiency
Solution Approach 1:
The positioning member is pre-positioned relative to the first bearing before the drive shaft and second bearing are assembled. This preliminary positioning establishes the correct coaxial alignment in advance, eliminating the need for difficult post-assembly adjustment and avoiding the adverse effects of gravity and magnetic forces during positioning.
Solution Approach 2:
The positioning member acts as an intermediary element between the first bearing and the second bearing. It provides a reference surface that guides the second bearing into correct coaxial alignment, simplifying the positioning process and eliminating the need for large adjustment forces.
2Productivity
If the drive shaft is mounted with the rotor before bearing positioning, then the motor assembly is complete, but gravity and magnetic forces interfere with bearing positioning
Solution Approach 1:
The assembly process is segmented into distinct stages: first positioning the positioning member relative to the first bearing, then assembling the drive shaft with rotor, and finally positioning the second bearing. This segmentation allows bearing positioning to be performed when the rotor is not yet attached, eliminating gravitational and magnetic interference while maintaining complete assembly capability.
Solution Approach 2:
The positioning member is installed and positioned before the rotor is mounted on the drive shaft. This preliminary action establishes the bearing alignment reference before gravitational and magnetic forces come into play, ensuring positioning accuracy while maintaining full assembly functionality.
3Reliability
If large force is applied to adjust bearing alignment against gravity and magnetic forces, then coaxial positioning can be achieved, but positioning errors increase and efficiency decreases
Solution Approach 1:
The positioning member serves as a mediator that provides a stable reference surface for positioning the second bearing. By using this intermediary element, the positioning process requires minimal force and achieves high accuracy without the need to overcome gravitational and magnetic forces, thereby maintaining both reliability and efficiency.
Data Source
AI summary
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 disclosure 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.