Oil Mist Separator With Movable Impact Surface
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Solution Overview
Problem
Existing oil mist separators for crankcase ventilation in internal combustion engines face challenges in maintaining efficient separation while minimizing pressure loss, especially at varying flow rates.
Innovation Solution
The oil mist separator incorporates a control protrusion that adjusts the flow cross-section of the nozzle aperture in response to flow rate changes, maintaining constant flow velocity and reducing pressure loss by increasing the distance between the nozzle and impact surfaces as flow rate increases, using a pretension force and biasing elements to control the movement of the impact surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the nozzle plate and impact surface is reduced to improve separation efficiency, then oil particle separation efficiency is improved, but pressure loss increases
Solution Approach 1:
The impact surface is made movable rather than fixed, allowing it to dynamically adjust its position relative to the nozzle plate based on flow rate. At high flow rates, the impact surface moves closer to maintain separation efficiency while minimizing pressure loss. At low flow rates, it moves away to reduce unnecessary pressure drop across the separator.
Solution Approach 2:
The distance parameter between the nozzle plate and impact surface is changed dynamically based on operating conditions. The system transitions from a fixed geometric configuration to a variable one where the spacing adapts to flow rate, optimizing both separation efficiency and pressure loss characteristics across different operating ranges.
2Speed
If the flow cross-section of the nozzle aperture is reduced to maintain constant flow velocity, then flow velocity remains constant, but pressure loss increases
Solution Approach 1:
The flow cross-section of the nozzle aperture is made dynamically adjustable through the control protrusion mechanism. As flow rate increases, the control protrusion reduces the effective flow cross-section to maintain constant flow velocity through the nozzle, preventing excessive pressure loss while ensuring proper separation conditions are maintained.
3Loss of energy
If the impact surface is moved away from the nozzle plate to reduce pressure loss, then pressure loss is reduced, but separation efficiency decreases
Solution Approach 1:
The impact surface position is dynamically adjusted based on flow rate conditions. At high flow rates where pressure loss is the primary concern, the impact surface moves away from the nozzle plate. At low flow rates where separation efficiency is more critical, the impact surface moves closer to the nozzle plate, ensuring optimal separation performance across all operating conditions.
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 allows for efficient oil mist separation across a wide range of flow rates with reduced pressure loss, ensuring consistent flow velocity and minimizing pressure drop, thereby enhancing the separator's performance under different engine conditions.
Implementation Method 1
a flow of the gaseous fluid through at least one aperture... can be moved away from the at least one nozzle plate in an opening direction against a pretension force by influence and dependent on a flow of the gaseous fluid
Implementation Method 2
control protrusion for controlling a flow cross-section of at least one valve aperture is attached to at least one impact surface
Implementation Method 3
at least one impact surface, which is arranged downstream of the nozzle plate relating to the flow of the gaseous fluid... for separating oil particles from a gaseous fluid
Data Source
Figure 1~2
Figure 3
Figure 4~9
AI summary
The present invention relates to an oil mist separator (10), in particular of a device for a crankcase ventilation (11), in particular of an internal combustion engine (13), in particular of a motor vehicle, for separating oil particles from a gaseous fluid, in particular blow-by gas, and a device for crankcase ventilation (11). The oil mist separator (10) has at least one nozzle plate (24). The at least one nozzle plate (24) is arranged in a flow way of the gaseous fluid. The nozzle plate (24) has at least one aperture (26; 126) for the gaseous fluid. The oil mist separator (10) further has at least one impact surface (32; 132). The at least one impact surface (32; 132) is arranged downstream of the nozzle plate (24) relating to the flow of the gaseous fluid. The at least one impact surface (32; 132) can be moved away from the at least one nozzle plate (24) in an opening direction (36) against a pretension force by influence and dependent on a flow of the gaseous fluid through the at least one aperture (26; 126). At least one aperture is formed as a nozzle aperture (26) and at least one control protrusion (42; 142) for controlling the flow cross-section of at least one aperture (26; 126) is attached to at least one impact surface (32).