Scroll Compressor Suction Duct Drain Port Design
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Solution Overview
Problem
Existing scroll compressors face challenges in effectively separating and managing lubricant mist within the suction flow path, leading to inefficiencies and potential contamination in the refrigerant compression process.
Innovation Solution
Incorporating a suction duct with a drain port in the scroll compressor housing to direct refrigerant flow and separate lubricant mist, allowing the lubricant to drain into a lubricant sump, thereby facilitating lubricant mist coalescence and separation before it enters the motor shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a suction duct is provided to direct refrigerant flow, then the refrigerant flow path is improved, but lubricant mist separation becomes insufficient
Solution Approach 1:
The suction duct is segmented into functional zones: an upper refrigerant flow path and a lower lubricant drainage path. The duct channel is divided such that refrigerant flows through the upper portion while lubricant mist drains through the lower portion into the lubricant sump, achieving effective separation of the two fluid streams.
Solution Approach 2:
The suction duct acts as an intermediary structure between the refrigerant inlet and the compression chamber. It mediates the flow by providing a dedicated path for lubricant mist to drain into the lubricant sump before the refrigerant enters the motor shell, preventing direct contact between lubricant and motor components.
2Device complexity
If lubricant mist is not effectively separated, then the structure remains simple, but lubricant contamination occurs
Solution Approach 1:
The suction duct combines multiple functions into a single component: it directs refrigerant flow, separates lubricant mist, and provides a drainage path to the lubricant sump. This merging of functions achieves effective lubricant separation without requiring additional separate components, maintaining structural simplicity.
Solution Approach 2:
The suction duct is designed to automatically separate and drain lubricant mist using gravity and flow dynamics. The duct geometry enables lubricant mist to coalesce and drain into the lubricant sump without requiring external power or complex mechanical separation mechanisms.
3Reliability
If the drain port is positioned at the bottom of the suction duct, then lubricant drainage is improved, but the duct design becomes more complex
Solution Approach 1:
The drain port is positioned at the lowest point (bottom) of the suction duct channel, creating a gravitational equipotential point where lubricant mist naturally accumulates and drains. This positioning utilizes gravity to achieve effective lubricant separation without requiring additional complex drainage mechanisms.
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
This solution enhances the separation of lubricant mist from the refrigerant flow, improving the compressor's efficiency and preventing lubricant contamination, allowing for better lubrication management and reduced operational issues.
Implementation Method 1
facilitate lubricant mist separation prior to gas flow into the motor shell in which coalesced lubricant mist drains through the drain port into the lubricant sump
Implementation Method 2
drain lubricant received in the suction duct into the lubricant sump
Data Source
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AI summary
A scroll compressor and assembly includes a suction duct to direct refrigerant from the housing inlet to a location upstream of a motor. Additionally, the suction duct includes drain ports that act to drain oil received in the suction duct into the oil sump. This can be used for filling and charging the oil sump with oil initially by using the common refrigerant inlet port through the housing and also acts to collect coalesced oil from oil mist generated by operation of the scroll compressor in a refrigeration system and likewise drain the lubricant oil into the lubricant sump.