Elliptical Outlet Oil Separator for Low-Loss Refrigerant Cleaning
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Solution Overview
Problem
In chiller systems, oil mixed with refrigerant gas reduces efficiency and requires frequent addition to maintain compressor performance, leading to inefficiencies and potential failures if not properly separated and returned.
Innovation Solution
A cylindrical oil separator with a non-circular outlet pipe is used to separate oil from refrigerant gas through centrifugal force, directing the mixture tangentially to create a swirling flow that separates oil from gas, which is then discharged and returned to the compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil is circulated with compressed refrigerant gas to lubricate and seal compressor components, then compressor performance is maintained, but oil mixes with refrigerant gas and reduces heat-transfer efficiency in condenser and evaporator
Solution Approach 1:
The oil separator divides the system into two separate flow paths: one for refrigerant gas discharge to the condenser and another for oil separation and return to the compressor. This segmentation prevents oil from entering the condenser and evaporator, maintaining heat-transfer efficiency while ensuring compressor lubrication through the oil return path.
Solution Approach 2:
The oil separator extracts oil from the oil-refrigerant gas mixture using centrifugal force generated by the non-circular outlet pipe geometry. The extracted oil is directed to the oil reservoir and then returned to the compressor, while the purified refrigerant gas is discharged to the condenser, separating the lubrication function from the refrigeration cycle.
2Reliability
If oil is removed from refrigerant gas using traditional filters, then oil separation is achieved, but system complexity and pressure drop increase
Solution Approach 1:
The patent replaces traditional mechanical filter systems with a centrifugal separation mechanism. The non-circular outlet pipe geometry generates centrifugal force that separates oil from refrigerant gas based on density differences, eliminating the need for filter media and reducing structural complexity while maintaining effective oil separation.
Solution Approach 2:
The invention changes the geometric parameters of the outlet pipe from a conventional circular cross-section to a non-circular cross-section. This parameter change creates asymmetric flow patterns and centrifugal effects that enhance oil separation efficiency without requiring additional mechanical components or increasing device complexity.
3Reliability
If more oil is added to the chiller system to compensate for oil loss, then compressor lubrication is maintained, but heat-transfer efficiency in condenser and evaporator further deteriorates
Solution Approach 1:
The oil separator implements a feedback mechanism by continuously monitoring and separating oil from the refrigerant gas stream, then returning the separated oil to the compressor. This closed-loop feedback ensures that the compressor receives adequate lubrication without allowing oil to accumulate in the condenser and evaporator, thereby maintaining both compressor performance and system heat-transfer efficiency.
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 effectively removes oil from refrigerant gas without the need for filters, enhancing chiller system efficiency by returning separated oil, thus reducing the need for frequent oil additions and preventing compressor failure.
Implementation Method 1
separating oil from the mixture by centrifugal force
Implementation Method 2
direct the compressed gas and oil mixture tangentially into the cylindrical housing... creating a swirling flow
Implementation Method 3
separating oil from the mixture by changing a flow direction of the mixture in the cylindrical housing
Implementation Method 4
The second portion includes an oil reservoir configured to contain oil separated from the gas and oil mixture
Data Source
AI summary
An oil separator for use in separating oil from refrigerant gas in a chiller system is provided. Its operation is based on centrifugal separation principles and does not require the use any type of filter or media pack to remove oil from refrigerant gas. The oil separator includes a non-circular (e.g., elliptical) refrigerant outlet pipe that transitions the linear flow from the inlet connection to a swirling (e.g., circular) flow within the cylindrical housing. The non-circular shape of the entrance to the refrigerant outlet pipe provides for more turbulent gas flow and a greater extraction of oil as well as minimization of pressure losses.