Oil Separator Throttle Diaphragm Dynamics
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Solution Overview
Problem
Unregulated oil separators in crankcase ventilation systems are inefficient in utilizing available power for oil separation, especially at varying engine operating conditions, leading to suboptimal oil separation and potential crankcase overpressures, and require additional components like pressure regulation valves to manage power usage.
Innovation Solution
A regulated oil-separating device with a plate-shaped throttle diaphragm that adjusts the nozzle gap dynamically based on engine conditions, eliminating the need for a pressure regulation valve and utilizing up to 100% of available power by varying the nozzle gap cross-section in response to changing pressures and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an unregulated oil separator is used with fixed pressure loss characteristics, then the device complexity is reduced, but the oil separation efficiency deteriorates under varying engine operating conditions
Solution Approach 1:
The patent applies the dynamics principle by making the oil separator's pressure loss characteristic variable through a movable closure element (throttle diaphragm) that adjusts the flow cross-section dynamically. This allows the oil separator to adapt its pressure loss to match available power at different engine operating conditions, resolving the contradiction between simple fixed design and efficient variable performance.
2Reliability
If the oil separator pressure loss is kept low to prevent crankcase overpressure, then the reliability is improved, but the oil separation efficiency deteriorates due to insufficient power utilization
Solution Approach 1:
The movable closure element dynamically adjusts the flow cross-section to vary pressure loss according to available power. At high power availability, pressure loss increases to maximize separation; at low power availability, pressure loss decreases to maintain reliable crankcase pressure control, thus resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent changes the pressure loss parameter dynamically through closure element position adjustment. This allows the system to optimize the balance between crankcase pressure control (reliability) and oil separation efficiency (productivity) by adapting pressure loss to available power at different operating conditions.
3Productivity
If a pressure regulation valve is added to manage power usage in unregulated oil separators, then the oil separation efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent merges the pressure regulation function directly into the oil separator's flow path by using a closure element positioned within the separator housing. This integrates the regulatory mechanism with the separation structure, achieving improved oil separation efficiency without adding separate pressure regulation valve components, thus resolving the contradiction between productivity and device complexity.
4Productivity
If the nozzle gap cross-section is reduced to increase pressure loss and power utilization, then the oil separation efficiency is improved, but the friction and tolerance requirements increase
Solution Approach 1:
Instead of relying on fixed small tolerances to achieve small gap cross-sections, the patent uses a dynamically adjustable closure element that can position itself to create the required flow restriction. This dynamic approach achieves high power utilization without the need for extremely precise manufacturing tolerances, resolving the contradiction between productivity and manufacturing precision.
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 device achieves efficient oil separation across all engine operating conditions without the need for additional pressure regulation, reducing mechanical complexity, and minimizing friction and tolerance requirements, ensuring optimal power utilization and preventing crankcase overpressures.
Implementation Method 1
A regulated oil-separating device with a plate-shaped throttle diaphragm that adjusts the nozzle gap dynamically based on engine conditions, eliminating the need for a pressure regulation valve and utilizing up to 100% of available power by varying the nozzle gap cross-section in response to changing pressures and flow rates
Implementation Method 2
The cleaning of crankcase ventilation gases involves the phase separation of a disperse phase in the form of small oil droplets in the order of magnitude of 1 μm and below, which are distributed in the gaseous phase of the ventilation gas. This physical process of phase separation is referred to as oil separation
Data Source
AI summary
An oil separation device includes an oil separator in a housing between a gas inlet and an outlet. An opening is formed at the longitudinal end of a gas-conducting channel connected to the gas inlet the end facing away from the gas inlet, and a throttle aperture movably mounted in the longitudinal direction of the gas conducting channel. The gas conducting channel and an outlet channel form an annular gap through which crankcase ventilation gases flow via a nozzle gap, and the housing has an additional opening to which a reference pressure can be applied on the throttle aperture side facing away from the gas conducting channel. The throttle aperture extends radially beyond the annular gap and has a seal region molded onto the edge that is sealingly arranged in a recess formed in the housing such that the throttle aperture fluidically separates the additional opening from the gas inlet.