Cylinder Head Embedded Pipe Throttle Region Flow Control
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Solution Overview
Problem
In cylinder heads for internal combustion engines, the curved portions of the water jacket can lead to a decrease in refrigerant flow rate, resulting in ineffective cooling of combustion chambers and potential temperature rises.
Innovation Solution
Incorporating a first and second throttle region with reduced sectional area in the curved portions of the pipe members, which are embedded in the cylinder head, to maintain a higher flow rate and reduce temperature rises in the combustion chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pipe member is curved to avoid interference with exhaust port or ignition plug, then the spatial arrangement is improved, but the refrigerant flow rate decreases due to increased pressure drop
Solution Approach 1:
The patent introduces a throttle region in the curved portion of the pipe member, which changes the cross-sectional area parameter at a specific location. This throttle region with reduced cross-sectional area compensates for the pressure drop caused by the curved geometry, thereby maintaining the refrigerant flow rate while preserving the beneficial curved path that avoids interference with exhaust ports and ignition plugs.
2Temperature
If the curved portion is designed to be close to the combustion chamber, then the cooling effectiveness is improved, but the flow rate decrease in the curved portion increases
Solution Approach 1:
The patent positions the throttle region in the curved portion of the pipe member to compensate for the flow rate decrease. By reducing the cross-sectional area at this specific location, the velocity and flow rate of the refrigerant are increased, which offsets the natural flow loss in the curved geometry. This ensures that even when the curved portion is positioned close to the combustion chamber for effective cooling, the refrigerant maintains sufficient flow rate to prevent excessive temperature rise.
3Device complexity
If the pipe member is embedded in the cylinder head, then the structural integration is improved, but the cooling efficiency decreases due to restricted refrigerant flow
Solution Approach 1:
The patent introduces a throttle region in the embedded pipe member that reduces the cross-sectional area at a specific location. This parameter change increases the refrigerant velocity and maintains flow rate despite the restrictions imposed by the embedding structure. The throttle region compensates for the flow restriction caused by the embedded configuration, ensuring that the pipe member can be integrated into the cylinder head structure while still achieving effective cooling of the combustion chamber.
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 suppresses temperature rises in combustion chambers by maintaining a higher flow rate through the curved portions, thereby enhancing cooling efficiency and preventing issues like knocking.
Implementation Method 1
a refrigerant flows through the pipe member... a temperature rise in a combustion chamber is more effectively suppressed
Implementation Method 2
there may be a decrease in flow rate due to an increase in refrigerant pressure drop... a first throttle region... a sectional area of the first throttle region is partially reduced
Data Source
AI summary
A cylinder head in an internal combustion engine includes a cylinder head main body in which a plurality of combustion chambers is arranged and a pipe member that extends along a direction in which the combustion chambers are arranged, through which a refrigerant flows, and which is embedded in the cylinder head main body. The pipe member is provided with a curved portion that is curved and the curved portion is provided with a throttle region in which a sectional area is partially reduced.