Motor Stator Passage Layout for Quieter Rotary Compressors
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Solution Overview
Problem
Conventional rotary compressors face issues with noise generation and lubricating oil runout due to the design of the motor stator passages, which affect the efficiency and reliability of the compressor.
Innovation Solution
The rotary compressor incorporates a motor stator with five first passages and at least one second passage, strategically positioned and sized to reduce noise by increasing flow path resistance and prevent oil runout by ensuring effective lubricating oil return to the reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional motor stator passages are designed with uniform configuration, then manufacturing is simple, but noise generation increases and oil return efficiency deteriorates
Solution Approach 1:
The motor stator passages are segmented into five distinct types (first through fifth passages) with different configurations, positions, and cross-sectional areas. This segmentation allows each passage to be optimized for specific functions: some passages prioritize oil return efficiency while others focus on noise reduction, resolving the contradiction between reliability and complexity by distributing different functional requirements across multiple specialized passages rather than using a uniform design
Solution Approach 2:
Different passages are assigned different local qualities in terms of cross-sectional area, position, and configuration. The first passages have larger cross-sectional areas positioned to optimize oil return, while the second through fifth passages have varying smaller areas positioned to create flow resistance for noise reduction. This local differentiation allows simultaneous optimization of oil return efficiency and noise control in different locations within the motor stator
2Reliability
If passages with large cross-sectional area are provided in all areas, then oil return is efficient, but noise level increases
Solution Approach 1:
The patent applies local quality by providing large cross-sectional area passages (first passages) only in five specific areas where oil return is prioritized, while providing smaller cross-sectional area passages (second through fifth passages) in other areas where noise reduction is prioritized. This spatial differentiation of passage qualities allows the system to achieve both efficient oil circulation and noise reduction simultaneously by matching passage characteristics to local functional requirements
Solution Approach 2:
The passage system is segmented into multiple categories with different cross-sectional areas and positions. The first passages with larger areas handle oil return function, while the second through fifth passages with smaller areas handle noise reduction function. This functional segmentation resolves the contradiction by assigning different passage configurations to different operational priorities in different locations
3Productivity
If continuous passages are provided in all areas, then flow resistance is low, but noise reduction effectiveness decreases
Solution Approach 1:
The patent implements local quality by creating discontinuous passage configurations in four of the nine areas, where passages are interrupted or blocked in specific sections. This creates localized flow resistance in those areas to reduce noise, while maintaining continuous passages in the five areas where oil return efficiency is prioritized. The spatial variation in passage continuity allows simultaneous optimization of oil flow and noise reduction
Data Source
AI summary
A rotary compressor includes a compression mechanism, a casing, a motor stator and a motor rotor. The motor stator includes stacked steel plates, teeth, and slots. The stacked steel plates are fixed to an inner surface of the casing. A number of the teeth and slots is nine. The motor rotor rotates a crankshaft to drive the compression mechanism. The stacked steel plates have first to ninth areas radially outside the nine teeth, first concave portions provided in five of the areas, and a second concave portion provided in at least one of four areas other than the five areas. The five first concave portions and an inner circumferential surface of a cylindrical portion form five first passages. The second concave portion and the inner circumferential surface of the cylindrical portion form at least one second passage.