Multi-Compressor Suction Line Mixing Device for Oil Equalization
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Solution Overview
Problem
In multi-compressor vapor compression systems, ensuring adequate lubrication of compressors is challenging, especially when using refrigerants with smaller molecules and higher viscosity oils, leading to uneven oil distribution and potential compressor damage.
Innovation Solution
Incorporating a mixing device within the suction line to increase internal turbulence of the refrigerant-oil mixture, with configurations such as honeycomb, vane, or swirl designs, to ensure even oil distribution among multiple compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple compressors are used in the vapor compression system, then the cooling capacity and productivity are improved, but the oil distribution becomes uneven and lubrication reliability deteriorates
Solution Approach 1:
A mixing device is introduced as an intermediary component in the suction line to mediate the distribution of oil between multiple compressors. The device creates turbulence that actively mixes the refrigerant-oil mixture, ensuring uniform oil distribution to all compressors regardless of their position in the system.
Solution Approach 2:
The mixing device changes the flow parameters of the refrigerant-oil mixture by creating turbulence. This turbulence increases the mixing efficiency and ensures that oil is evenly distributed throughout the suction line, preventing any compressor from receiving insufficient lubrication.
2Quantity of substance
If higher viscosity oil is used with refrigerants having smaller molecules, then the oil circulation rate increases, but the oil dispersal becomes uneven and lubrication becomes inadequate
Solution Approach 1:
The mixing device generates mechanical turbulence in the suction line, which acts as a form of mechanical vibration or disturbance to the refrigerant-oil flow. This turbulence breaks up oil aggregates and ensures uniform dispersion of high-viscosity oil throughout the refrigerant mixture, preventing uneven distribution to compressors.
3Device complexity
If no mixing device is installed, then the device complexity is reduced, but the oil distribution becomes uneven and compressor lubrication becomes inadequate
Solution Approach 1:
A relatively simple mixing device is introduced as an intermediary component in the suction line to mediate the distribution of oil between multiple compressors. The device creates turbulence that actively mixes the refrigerant-oil mixture, ensuring uniform oil distribution to all compressors regardless of their position in the 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
The mixing device ensures each compressor receives an adequate amount of oil, preventing inadequate lubrication and potential damage by evenly distributing the oil throughout the system.
Implementation Method 1
The mixing device configured to increase an internal turbulence of the working fluid
Data Source
AI summary
A mixing device and a vapor compression system incorporating a mixing device are provided. The vapor compression system includes a suction line, at least two compressors, and at least one mixing device that is predominantly open (e.g., i.e., include at least a certain percentage, such as seventy percent (70%), of voids/openings). The suction line is used for transferring a working fluid made up of a mixture of a refrigerant and an oil. The suction line includes at least one inlet (e.g., for receiving the working fluid) and at least one outlet (e.g., for distributing the working fluid). The vapor compression system include a first compressor fluidly connected to a first outlet and a second compressor fluidly connected to a second outlet. At least one mixing device is disposed within the suction line (e.g., to increase an internal turbulence of the working fluid).