Oil Mist Separator Nozzle Impact Wall Design
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Solution Overview
Problem
Existing oil mist separators for internal combustion engines do not achieve a high enough separation rate to effectively reduce oil consumption and pollutant emission, despite tightening emission regulations.
Innovation Solution
An oil mist separator designed as an impactor with a nozzle device and an impact wall coated with separation material, where the distance between the nozzle and the impact wall is reduced to enhance flow deflection and separation efficiency, utilizing multiple nozzles to force blow-by gas through a rugged intermediate space, thereby increasing separation effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between the nozzle and the impact wall is reduced, then the separation rate is improved, but the flow velocity increases causing higher differential pressure
Solution Approach 1:
The impact wall is designed with non-uniform geometry where the distance to the nozzle varies across different regions. Specifically, the impact wall has a greater distance from the nozzle in regions where high flow velocity occurs, while maintaining smaller distances in other regions. This local variation in geometry allows the system to achieve high separation rates in critical areas while controlling differential pressure by providing larger clearance in high-velocity zones, thus resolving the technical contradiction between separation efficiency and pressure differential.
2Manufacturing precision
If multiple nozzles are used to increase separation effectiveness, then the separation rate is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple nozzles into a single integrated nozzle device assembly, and multiple impact wall regions into one unified impact wall structure. This merging approach allows the system to achieve enhanced separation effectiveness through multiple nozzle outlets while avoiding the complexity of separate independent separation units. The combined design simplifies the overall device architecture while maintaining the benefits of multi-nozzle operation for improved oil mist separation.
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 achieves a high separation rate with improved efficiency, safety, and low differential pressure, effectively reducing oil consumption and pollutant emissions by enhancing the separation of oil particles from blow-by gas.
Implementation Method 1
a very strong flow deflection of the blow-by gas in the region of the nozzles is enforced
Implementation Method 2
an oil mist separator designed as an impactor with a nozzle device and an impact wall
Implementation Method 3
the impact wall is coated with a separation material, in particular a fleece or a knitted material, for increasing the separation effect
Implementation Method 4
an oil mist is generated which is aerosolically dissolved and mixes with the blow-by gas
Data Source
AI summary
An oil mist separator for a crankcase ventilation system of an internal combustion engine may include a nozzle device having a plurality of nozzles. The plurality of nozzles may each have a nozzle outlet. An impact wall may be disposed opposite to the plurality of nozzles and may be covered with a separation material. A distance may be configured between the plurality of nozzles and the separation material, which is reduced compared to a surrounding region. The plurality of nozzles may project towards the separation material and thereby reduce the distance of the nozzle outlet of the plurality of nozzles to the separation material compared to the surrounding region.