Fluid Control Valve Thermal Insulation via Press-Inserted Protection Member
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Solution Overview
Problem
Existing fluid control valves in exhaust gas recirculation systems face issues with thermal transmission, leading to increased temperatures beyond allowable limits, which can cause deformation, degrade material quality, and affect the durability and rigidity of the housing, especially when handling high-temperature exhaust gases above 500°C.
Innovation Solution
A fluid control valve design featuring a housing made of aluminum die-cast material with a press-inserted protection member, such as a stainless steel nozzle, that forms a thermal insulating layer to restrict thermal transmission from the protection member to the housing, maintaining the housing's dimensional accuracy and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing is made of aluminum die-cast material, then manufacturing cost is reduced and dimensional accuracy is improved, but thermal resistance deteriorates causing temperature to exceed allowable limits
Solution Approach 1:
A protection member made of heat-resistant material is introduced as an intermediary between the high-temperature exhaust gas and the aluminum housing. This protection member has a thermal insulating layer that mediates heat transfer, preventing excessive heat from reaching the housing while maintaining the cost-effective aluminum construction.
Solution Approach 2:
The protection member is constructed using composite material structure combining a heat-resistant base material with a thermal insulating layer. This composite structure provides both thermal resistance and mechanical strength, allowing the housing to maintain low temperature while the overall system handles high-temperature exhaust gas.
2Temperature
If the housing is made of heat-resistant material, then temperature resistance is improved, but manufacturing cost increases due to required machining
Solution Approach 1:
The heat resistance function is segmented from the housing structure. Instead of making the entire housing heat-resistant, only a specific protection member that contacts the exhaust gas is made of heat-resistant material. This segmentation allows the main housing to remain as cost-effective die-cast aluminum while providing localized heat resistance where needed.
Solution Approach 2:
The protection member made of heat-resistant material serves as a sacrificial or replaceable component that protects the main housing. By concentrating heat resistance in this separate, potentially replaceable part, the expensive heat-resistant material is used only where necessary, rather than throughout the entire housing structure.
3Temperature
If cooling water is supplied through the cooling water passage, then temperature control is improved for exhaust gas below 400°C, but thermal transmission from high-temperature exhaust gas above 500°C exceeds the allowable limit
Solution Approach 1:
The protection member is installed in advance before the exhaust gas reaches the housing, creating a thermal barrier that prevents excessive heat from reaching the housing in the first place. This preliminary thermal protection eliminates the need for aggressive cooling measures and prevents thermal transmission before it becomes harmful.
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
The solution effectively reduces thermal transmission, preventing the housing from exceeding its temperature limit, maintaining its shape and quality, and enhancing heat resistance without the need for costly machining, thus reducing manufacturing costs and ensuring reliable operation.
Implementation Method 1
The protection member and a wall surface, which defines the fluid passage in the housing, define therebetween a thermal insulating layer for restricting thermal transmission of the fluid flow from the protection member toward the housing
Data Source
AI summary
A fluid control valve includes a housing defining therein a fluid passage. The fluid control valve further includes a valve member for controlling a fluid flow in the fluid passage by communicating and blocking by the fluid passage. The fluid control valve further includes a protection member being press-inserted into the housing for protecting the housing from heat of the fluid flow in the fluid passage. The housing is formed by die casting of an aluminum material. The protection member and a wall surface, which defines the fluid passage in the housing, define therebetween a thermal insulating layer for restricting thermal transmission of the fluid flow from the protection member toward the housing.