Compressor Oil Cascade Layout for Uniform Sump Levels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multiple-compressor systems, such as refrigeration systems, maintaining a sufficient oil level across compressors is challenging due to variations in compressor designs and piping configurations, making equal oil distribution difficult.
Innovation Solution
A refrigeration system with compressors connected in series, where a common supply line provides refrigerant and oil, with the lead compressor having the highest oil sump pressure and sequentially lower pressures in downstream compressors, facilitating oil distribution through a cascade effect, and additional oil distribution lines connecting adjacent compressors to ensure oil flow from higher to lower pressure compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common supply line distributes oil to multiple compressors, then oil distribution is simplified, but unequal oil levels occur due to variations in compressor designs and piping configurations
Solution Approach 1:
The patent applies local quality by providing each compressor with a dedicated oil return line that returns oil directly to its own suction line, rather than using a common distribution system. This localized approach allows each compressor to maintain its own optimal oil level independently, compensating for variations in compressor design and piping configuration while keeping the overall system relatively simple
2Reliability
If oil is distributed equally to all compressors, then each compressor receives sufficient lubrication, but variations in compressor designs and piping configurations prevent equal distribution
Solution Approach 1:
The patent segments the oil return function by providing each compressor with its own dedicated oil return line that connects directly to its suction line. This segmentation allows each compressor to independently manage its oil level and lubrication needs, ensuring reliable lubrication for each unit while adapting to different compressor designs and piping configurations without requiring a complex centralized control system
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 configuration ensures consistent oil distribution across compressors, maintaining optimal oil levels and system performance by leveraging the pressure cascade and additional oil distribution lines, even when compressors are running.
Implementation Method 1
the lead compressor has the highest oil sump pressure, and the oil sump pressures of the non-lead compressors are successively lower with respect to its position downstream of the lead compressor
Implementation Method 2
Each compressor has an oil sump located in a gravitational bottom of the compressor
Implementation Method 3
Oil sump pressures for the plurality of compressors are maintained such that the lead compressor has the highest oil sump pressure
Data Source
AI summary
A refrigeration system includes a plurality of compressors connected in series with each other. Each compressor has an oil sump located in a gravitational bottom of the compressor. A common supply line supplies refrigerant and oil to each of the plurality of compressors. The plurality of compressors includes a lead compressor and one or more non-lead compressors. The common supply line is configured to return more oil to the lead compressor than to the one or more non-lead compressors. Oil sump pressures for the plurality of compressors are maintained such that the lead compressor has the highest oil sump pressure, and the oil sump pressures of the non-lead compressors are successively lower with respect to its position downstream of the lead compressor. As a result, oil is distributed between adjacent compressors from the lead compressor, which is a most upstream compressor, sequentially downstream to the one or more non-lead compressors.