Rotary Compressor Roller Key Assembly for Bearing Wear Control
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Solution Overview
Problem
Existing rotary compressors face issues such as friction loss and abrasion between the roller and bearings, leakage between compression chambers, increased manufacturing costs due to complex assembly processes, and limitations in material selection for the roller and rotating shaft, which affect efficiency and reliability.
Innovation Solution
A rotary compressor design that includes a rotation preventing unit with a rotation preventing groove in the roller and a rotation preventing key on the rotating shaft, allowing for relative motion while constraining axial movement, enabling separate manufacturing and assembly of the roller and shaft, and allowing for different material selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the roller and rotating shaft are manufactured as a single body, then coupling reliability is improved, but friction loss and abrasion occur between the roller and bearing, and leakage between compression chambers increases
Solution Approach 1:
The roller and rotating shaft are divided into separate components that can be assembled together. The roller is inserted into the rotating shaft through a shaft hole, allowing independent manufacturing and assembly while maintaining coupling reliability. This segmentation enables the roller to move axially relative to the shaft, preventing friction loss and abrasion between the roller and bearing.
2Ease of manufacture
If the roller and rotating shaft are manufactured as a single body, then assembly process is simplified, but material selection is limited and weight reduction is constrained
Solution Approach 1:
The roller and rotating shaft are manufactured separately and then assembled. This allows different materials to be selected for each component based on their specific functional requirements. The roller can be made from lighter materials optimized for its specific function, while the shaft can use materials optimized for structural requirements, enabling overall weight reduction while maintaining assembly simplicity.
3Adaptability or versatility
If the roller and rotating shaft are post-assembled, then material selection flexibility is improved, but manufacturing time and cost increase due to additional assembly and post-machining processes
Solution Approach 1:
The shaft hole is formed in advance during the roller manufacturing process, before assembly with the rotating shaft. This preliminary action eliminates the need for complex post-assembly machining operations, reducing manufacturing time and cost while maintaining the flexibility of separate component manufacturing and material selection.
4Manufacturing precision
If the roller is allowed to move axially with the rotating shaft during magnetic centering, then rotor-stator alignment is achieved, but friction loss and abrasion occur between the roller and main bearing
Solution Approach 1:
The roller is designed to move axially relative to the rotating shaft during the magnetic centering process to achieve proper rotor-stator alignment. After alignment is achieved, the roller's axial movement is constrained by the shaft hole, preventing further friction loss and abrasion between the roller and main bearing while maintaining the achieved alignment precision.
Data Source
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AI summary
Provided is a rotary compressor. The rotary compressor includes a rotation preventing key between a roller and a rotating shaft: The roller is a separable-type roller assembled into the rotating shaft. The rotation preventing unit may constrain rotation of the roller and allow axial movement of the roller with respect to the rotating shaft. Thus, axial movement of the roller along the rotating shaft may be suppressed, and thus, friction loss and abrasion between the roller and a main bearing or between the roller or a sub bearing may be suppressed.