Oil Mist Separator Constriction Limits Backflow
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Solution Overview
Problem
Existing oil mist separators in internal combustion engines face challenges in limiting backward flow of blow-by gas through the discharge port, often requiring complex structures or additional components, which increase size and component count.
Innovation Solution
An oil mist separator design featuring a case with an inflow and outflow port, a separation unit, and an oil discharge unit with a constriction above the discharge port, which increases pressure loss and limits backward flow of blow-by gas by utilizing a constriction with a smaller cross-sectional area and a bent or inclined configuration to separate oil mist effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drain pipe with predetermined oil storage depth is used to restrict backward flow, then backward flow is restricted, but the vertical dimension increases and device size increases
Solution Approach 1:
The invention changes the geometric parameters of the discharge port by introducing a constriction with a reduced cross-sectional area. This parameter change creates sufficient flow resistance to restrict backward flow without requiring a deep drain pipe, thereby resolving the contradiction between reliability and vertical dimension.
2Reliability
If a jiggle valve is used to restrict backward flow, then backward flow is restricted, but the number of components increases
Solution Approach 1:
The invention extracts and eliminates the jiggle valve component from the system. Instead of using a mechanical check valve, the design relies on the constriction geometry alone to provide flow resistance, thereby maintaining reliability while reducing device complexity and component count.
Solution Approach 2:
The constriction structure provides self-service by inherently creating sufficient flow resistance through its geometric design. The reduced cross-sectional area automatically restricts backward flow without requiring any additional active components or mechanisms, making the system simpler and more reliable.
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 effectively limits the backward flow of blow-by gas containing oil mist with a simpler structure, reducing the need for additional components and maintaining efficient oil discharge, thus optimizing the separator's performance and size.
Implementation Method 1
increases pressure loss and limits backward flow of blow-by gas
Implementation Method 2
separate oil mist contained in blow-by gas
Data Source
AI summary
An oil mist separator includes a case including an inflow port into which blow-by gas flows and an outflow port out of which blow-by gas flows, a separation unit arranged in the case, and an oil discharge unit arranged at a lower part of the case. The oil mist separator is configured to separate oil mist contained in blow-by gas by the separation unit and discharge oil separated by the separation unit to an outside of the case through the oil discharge unit. The oil discharge unit includes a discharge port through which oil is discharged to the outside of the case and a constriction arranged above the discharge port. The constriction is partially decreased in a small cross-sectional flow area.