Oil Separator Helical Augers Pressure Drop
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Solution Overview
Problem
Conventional oil separators face challenges in maximizing oil separation efficiency during varying flow rates and tend to experience high pressure losses, which hinder the drainage of separated oil, limiting their effectiveness in internal combustion engines.
Innovation Solution
The oil separator design incorporates a housing with modular augers having helical flights of different pitches and a plunger valve system that adjusts flow area in response to pressure changes, ensuring optimal velocity and surface area for oil separation, while minimizing pressure drop through a fine mist separator assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional oil separators use fixed helical flow paths, then oil separation efficiency is maintained under specific flow conditions, but separation efficiency deteriorates when flow rates vary
Solution Approach 1:
The patent applies the dynamics principle by making the helical flow path adjustable through movable partition walls that can change the cross-sectional area of the flow channel. This allows the oil separator to adapt its flow path geometry dynamically in response to varying crankcase gas flow rates, maintaining optimal separation efficiency across different operating conditions rather than being fixed for a single design point.
Solution Approach 2:
The patent implements parameter changes by varying the cross-sectional area of the helical flow path and the pitch of the spiral member based on operating conditions. By changing these geometric parameters, the separator optimizes the balance between gas velocity (needed for centrifugal separation) and residence time (needed for droplet coalescence), thereby maintaining high separation efficiency across a range of flow rates.
2Productivity
If the helical flow path is designed for high velocity to maximize oil coalescence, then oil separation efficiency improves, but pressure drop increases which interferes with oil drainage
Solution Approach 1:
The patent applies dynamics by enabling the system to adjust the flow path cross-sectional area and spiral pitch according to operating conditions. Under high flow rate conditions, the separator can configure for higher velocities to maintain separation efficiency, while under low flow conditions, it can adjust to reduce pressure drop, thereby optimizing the trade-off between separation performance and drainage capability across different operating regimes.
Solution Approach 2:
The patent changes geometric parameters including the cross-sectional area of the helical flow path and the pitch of the spiral member. By adjusting these parameters, the system optimizes gas velocity for oil droplet separation while controlling pressure drop to ensure adequate drainage, resolving the contradiction between achieving high separation efficiency and maintaining low pressure loss.
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 design enhances oil separation efficiency across varying flow rates with reduced pressure losses, allowing for efficient oil collection and drainage, and provides flexibility for use with different engine sizes and configurations.
Implementation Method 1
small oil droplets pass and coalesce into larger droplets on the inner wall of the channel due to centrifugal forces created as the oil-laden gases pass through the helical flow path
Implementation Method 2
The larger droplets are then directed by gravity to oil outlets and passed to a sump, which generally holds excess oil in the system
Data Source
AI summary
An oil separator for separating oil from oil-laden gases includes a housing having a plurality of cavities with an auger disposed in each cavity. Each auger has a helical flight extending about a longitudinal central axis between inlet and outlet ends. At least one of the augers has an annular wall extending from the inlet end with an end cap, including an inlet, extending thereover to delimit an inlet chamber. A valve head is disposed in the inlet chamber, wherein a spring member biases the valve head to perfect a seal over the inlet to inhibit the flow of oil-laden gases therethrough. The valve head is moveable against the bias of the spring member to an open position in response to pressure applied against the valve head sufficient to overcome the spring member bias to promote the flow of oil-laden gases through the inlet chamber and about the auger.