Oil return flow path for a compressor
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Solution Overview
Problem
Conventional compressors face challenges in efficiently guiding and managing lubricant flow, leading to lubricant splashing and loss, which affects the compressor's efficiency and performance.
Innovation Solution
A compressor design featuring a casing with an oil return flow path that includes a uniform-cross-section flow path and a varying-cross-section flow path, where the lower end of the varying-cross-section flow path has a greater width and smaller thickness, guiding lubricant discharged from the compression mechanism downward along the inner surface of the casing, reducing splashing and enhancing lubricant retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a conventional oil return passage is used, then the structure is simple, but lubricant splashing and loss occur
Solution Approach 1:
The oil return flow path is divided into multiple sections: a first flow path section with a first cross-sectional area, a second flow path section with a second cross-sectional area, and a third flow path section with a third cross-sectional area. The cross-sectional area gradually decreases from the first to the third section, creating staged flow control that reduces lubricant splashing while maintaining manageable structural complexity
Solution Approach 2:
The cross-sectional area parameter of the flow path is changed progressively along the flow direction. The first cross-sectional area is larger than the second, which is larger than the third, creating a gradual parameter transition that controls lubricant flow velocity and reduces splashing without requiring abrupt structural changes
2Loss of substance
If the cross-sectional area is reduced to reduce splashing, then lubricant loss decreases, but flow resistance increases
Solution Approach 1:
The flow path is segmented into three sections with progressively decreasing cross-sectional areas. This segmentation allows the lubricant to gradually adapt to the narrowing passage, reducing sudden flow separation and turbulence that would cause excessive energy loss, while still achieving the goal of reduced splashing and lubricant loss
Solution Approach 2:
The flow path cross-sectional area is made dynamic rather than static, transitioning from a larger first area to a smaller second area, and finally to an even smaller third area. This dynamic progression allows the flow characteristics to change gradually, balancing the need to reduce splashing with the need to maintain acceptable flow resistance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces lubricant splashing and loss, improving the compressor's efficiency by ensuring most of the lubricant flows along the inner surface of the casing, thereby enhancing operational performance.
Implementation Method 1
a oil return flow path that extends in a top-to-bottom direction to guide the lubricant discharged from the compression mechanism downward
Data Source
AI summary
A compressor includes a casing that stores lubricant at a bottom, a compression mechanism disposed in the casing to suck and compress a refrigerant, and an oil return member forming an oil return flow path that extends in a top-to-bottom direction to guide the lubricant discharged from the compression mechanism downward. The oil return flow path includes a uniform-cross-section flow path, and a varying-cross-section flow path continuous with a lower end of the uniform-cross-section flow path. A lower end of the varying-cross-section flow path forms an outlet of the oil return flow path and lies along an inner surface of the casing. A the lower end of the varying-cross-section flow path has a greater width than an upper end of the varying-cross-section flow path, and the lower end of the varying-cross-section flow path has a smaller thickness than the upper end of the varying-cross-section flow path.