EGR Valve Cooling Circuit Integration
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Solution Overview
Problem
Conventional exhaust gas recirculation (EGR) valves face challenges in achieving sufficient cooling of high-temperature exhaust gases due to limitations in the design and integration of cooling water circuits, particularly in drop-in types, where the cooling effect is compromised by independent cooling water circuits on the EGR valve and attachment unit, and the linear shape of the cooling water circuit restricts enhanced cooling.
Innovation Solution
The integration of a cooling water circuit between the EGR valve and the attachment unit, forming an annulus ring-shaped passage that encloses the bearing area and exhaust gas passage, eliminating the need for a cooling water hose nipple, allowing for enhanced flexibility and cooling efficiency by communicating the cooling water passages on both sides, and incorporating additional passages to prevent stagnation and increase contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling water circuit is formed around the housing in a conventional EGR valve, then the main parts of the EGR valve are protected from heat, but the cooling effect is insufficient when high-temperature exhaust gas flows through the exhaust gas passage
Solution Approach 1:
The patent merges the cooling water circuit functions of the EGR valve and attachment unit into a single integrated circuit. The cooling water passage is formed to continuously enclose the exhaust gas passage from the attachment unit through the EGR valve housing, eliminating the need for separate cooling circuits and improving overall cooling efficiency while maintaining heat resistance protection.
2Ease of operation
If a nipple is press-fitted into the cooling water circuit to connect cooling water hose, then cooling water flow is enabled, but the shape of the cooling water circuit is limited to linear configuration
Solution Approach 1:
The patent integrates the cooling water inlet and outlet directly into the housing structure without requiring separate nipples or hoses. The cooling water passage is formed as a continuous integrated path within the housing, allowing flexible non-linear configurations that improve cooling efficiency while eliminating the need for additional connection components.
3Adaptability or versatility
If independent cooling water circuits are formed on both EGR valve and attachment unit, then each component can be cooled separately, but the overall cooling effect is reduced and system complexity increases
Solution Approach 1:
The patent merges the cooling water circuits of the EGR valve and attachment unit into a single integrated system. The cooling water passage continues seamlessly from the attachment unit through the EGR valve housing, creating an unified cooling system that improves overall cooling effectiveness while reducing system complexity and eliminating the need for separate cooling circuits.
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 configuration significantly enhances the cooling effect on the main parts and drop-in portion of the EGR valve, reduces part count and manufacturing complexity, and lowers costs by eliminating the need for a separate cooling water hose and nipple, while allowing for varied and efficient cooling water passage shapes.
Implementation Method 1
a water-cooling circuit for cooling the exhaust gas flowing through the exhaust gas passage
Implementation Method 2
produce a cooling effect on the high-temperature exhaust gas flowing through the exhaust gas passage
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An attaching system of an exhaust gas recirculation valve includes: an attachment unit 2 to be communicated with an exhaust gas circulation passage of an internal combustion engine; and an exhaust gas recirculation valve 1 that is fitted to the attachment unit and that has an exhaust gas passage to be communicated with the exhaust gas circulation passage, wherein the exhaust gas recirculation valve has a water-cooled passage 12 to be communicated with a water-cooled passage 15 for cooling the exhaust gas passage provided with the attachment unit, when fitted to the attachment unit.