Liquid-Cooled Engine Cooling Jacket with Riser Manifold Flow Path
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Solution Overview
Problem
Existing liquid-cooled internal combustion engines inadequately cool the liners and operate against the thermosyphon effect, leading to inefficient coolant flow, especially in emergency conditions.
Innovation Solution
A coolant inlet connects directly to the cylinder housing's cooling jacket, which is flow-connected to the upper partial cooling chamber via riser manifolds, allowing coolant to flow transversally through the engine, and bypass openings divert vapor bubbles to the bottom partial cooling chamber for enhanced cooling of thermally critical areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant flows from upper partial cooling chamber via bottom partial cooling chamber into cooling jacket, then cooling system is established, but cooling of liners is insufficient and flow occurs against thermosyphon effect
Solution Approach 1:
The patent inverts the traditional coolant flow direction by introducing coolant directly into the cooling jacket first, then flowing upward through riser manifolds to the upper partial cooling chamber, and subsequently through transfer openings to the bottom partial cooling chamber. This reversed flow path aligns with the thermosyphon effect, allowing hot coolant to rise naturally and improving liner cooling efficiency.
Solution Approach 2:
The patent utilizes the thermosyphon effect (natural convection driven by density differences) to optimize coolant flow. By positioning the coolant inlet in the cooling jacket and creating upward flow paths through riser manifolds, the system harnesses buoyancy forces to enhance coolant circulation without additional pumping energy, particularly benefiting emergency operation conditions.
2Device complexity
If coolant inlet opens into upper partial cooling chamber, then cooling system is simple, but thermally critical areas like bottom partial cooling chamber and liners are not sufficiently cooled
Solution Approach 1:
The patent implements local quality enhancement by introducing dedicated coolant inlet openings directly into the cooling jacket at strategic locations, and by using riser manifolds to distribute coolant locally to the upper partial cooling chamber. This ensures that thermally critical areas such as liners and the bottom partial cooling chamber receive adequate coolant flow and heat removal.
Solution Approach 2:
The patent adds vertical dimensionality to the coolant flow path by introducing riser manifolds that connect the cooling jacket to the upper partial cooling chamber. This creates a multi-level cooling architecture where coolant flows upward through vertical passages, ensuring comprehensive coverage of thermally critical areas that would be difficult to reach with a single-plane cooling system.
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 improves cooling efficiency, aligns coolant flow with the thermosyphon effect, and effectively cools critical areas like liners and exhaust valve crosspieces, preventing vapor accumulation and enhancing engine performance.
Implementation Method 1
by using the physical thermosyphon effect, to achieve an improved cooling of thermally critical areas
Data Source
AI summary
A liquid-cooled internal combustion engine which includes a cylinder housing for at least one cylinder and at least one cylinder head, with the at least one cylinder in the cylinder housing being enclosed by a cooling jacket and with a bottom partial cooling chamber adjacent to a fire deck and an upper partial cooling chamber which is flow-connected with the same via at least one transfer opening being arranged in the cylinder head which is connected with the cylinder housing, with a coolant outlet which can be connected with a pressure sink originating from the bottom partial cooling chamber. In order to improve cooling, at least one coolant inlet which can be connected with a pressure source opens into the cooling jacket of the cylinder housing and the cooling jacket is flow-connected directly with the upper partial cooling chamber via at least one riser manifold, so that coolant flows in engine operation from the pressure source to the cooling jacket of the cylinder housing and from there to the upper partial cooling chamber of the cylinder head and further via the transfer opening into the bottom partial cooling chamber and from there to the pressure sink.