Exhaust Gas Pressure Regulator Annular Gap Design
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Solution Overview
Problem
Existing exhaust gas pressure regulators for heavy diesel engines face oscillation issues due to pressure variations, requiring tight tolerances to maintain correct alignment and prevent oscillation, which complicates manufacturing and reduces robustness.
Innovation Solution
The design incorporates a moveable regulating member with a predetermined radial distance from the duct, creating a uniform annular gap that allows for small variations in dimensions while maintaining effective closure, reducing oscillations and increasing robustness by allowing the regulator to operate in multiple positions for substantial flow path closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moveable member is positioned close to the diffuser duct to restrict exhaust gas flow, then the exhaust gas pressure regulator can prevent exhaust gas from flowing through, but pressure variations cause the moveable member to oscillate back and forth rapidly
Solution Approach 1:
A spring element is introduced as an intermediary between the moveable member and the diffuser duct. This spring provides a cushioning effect that absorbs pressure variations and prevents direct contact between the moveable member and the duct wall, thereby eliminating oscillation while maintaining flow restriction capability.
Solution Approach 2:
The spring element is pre-installed to provide cushioning before pressure variations can cause the moveable member to oscillate. This beforehand cushioning absorbs the impact of pressure changes and maintains stable positioning of the moveable member against the diffuser duct.
2Reliability
If tight tolerances are used to ensure correct end position and prevent oscillation, then operational stability improves, but manufacturing complexity and cost increase
Solution Approach 1:
The introduction of the spring element changes the operational parameters of the system, allowing the moveable member to maintain correct positioning through elastic deformation rather than relying on tight manufacturing tolerances. This enables standard tolerances to be used while achieving the same operational stability.
3Reliability
If the moveable member is positioned at a predetermined radial distance to create a uniform gap, then oscillations are reduced and robustness increases, but exhaust gas flow is not completely restricted
Solution Approach 1:
The moveable member is positioned to create a small uniform gap that allows a minimal amount of exhaust gas to pass through. This partial restriction is sufficient to build up the necessary pressure upstream while maintaining operational robustness and preventing oscillation. The spring element ensures this gap remains uniform during operation.
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 reduces the risk of oscillations and increases the robustness of the exhaust gas pressure regulator, allowing for longer operational life and reduced manufacturing tolerances, while maintaining performance across various positions of the moveable member.
Implementation Method 1
a built up pressure on the turbo side will eventually cause the moveable member to move back towards its open position
Implementation Method 2
by preventing exhaust gas to flow out from the engine the exhaust gas will be compressed within the cylinder
Data Source
AI summary
An exhaust gas pressure regulator ( 100) for an engine (10) is provided. The exhaust gas pressure regulator comprises an exhaust gas duct (1 10) delimiting an exhaust gas flow path (106) and a regulating member (120), which is moveable in a first direction in the exhaust gas duct (1 10) between a first end position, in which the exhaust gas flow path (106) is open for exhaust gas throughflow, and a second end position, in which the regulating member (120) at least substantially closes the exhaust gas flow path ( 106) for exhaust gas throughflow, wherein said regulating member ( 120) and said exhaust gas duct ( 1 10) are configured for defining an annular gap ( 170) when the regulating member (120) is positioned in the second end position for allowing exhaust gas to flow through said exhaust gas pressure regulator (100).