Multiple-compressor system with oil balance control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multiple-compressor climate-control systems, oil levels in compressors can become imbalanced, leading to inefficiencies and reduced reliability, as oil levels decrease in one compressor while increasing in another, affecting the system's ability to provide cooling and heating effectively.
Innovation Solution
A climate-control system with a suction manifold and control module that adjusts the position of a suction valve to equalize oil levels between compressors by controlling fluid flow, using sensors and predefined operating-envelope maps to maintain balanced lubricant levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple compressors operate in parallel without oil balance control, then system capacity and flexibility are improved, but oil level imbalance occurs between compressors leading to reduced reliability
Solution Approach 1:
The system employs sensors to detect oil levels in each compressor and uses this feedback information to control the suction valve positioning. The control module continuously monitors oil levels and adjusts the suction valve to maintain balanced oil distribution, ensuring reliable operation while preserving the benefits of multiple compressors operating in parallel
Solution Approach 2:
The suction manifold acts as an intermediary component that distributes refrigerant flow to multiple compressors. By incorporating a controllable suction valve in the manifold, the system mediates the oil balance between compressors, allowing multiple units to operate simultaneously without suffering from oil level imbalance
2Device complexity
If suction valve position is fixed, then device complexity is reduced, but oil level equalization between compressors cannot be achieved
Solution Approach 1:
The suction valve transitions from a fixed position to a dynamically adjustable component. The valve position is continuously varied based on real-time oil level measurements from each compressor, enabling the system to adapt to changing operating conditions and maintain oil balance without excessive complexity through automated control
Data Source
AI summary
A climate-control system may include first and second compressors and a suction manifold. The first compressor includes a first shell, a first compression mechanism, and a first suction inlet through which working fluid is drawn into the first compressor. The second compressor includes a second shell, a second compression mechanism, and a second suction inlet through which working fluid is drawn into the second compressor. The suction manifold includes first and second arms. The first arm provides working fluid to the first suction inlet. The second arm provides working fluid to the second suction inlet. The second arm includes a first suction pipe, a second suction pipe, and a suction valve. The suction valve is movable between a first position in which working fluid is allowed to flow through the first suction pipe and a second position in which working fluid is allowed to flow through the second suction pipe.