Piston Engine Cooling via Housing Openings
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Solution Overview
Problem
Piston engines face inefficiencies due to heat buildup, which reduces their effectiveness and operational performance, particularly in high-pressure applications like compressors and motors.
Innovation Solution
Incorporating a cooling system with strategically placed cooling openings in the housing and walls of the piston machine, allowing for convective cooling using a cooling fluid to reduce the temperature of the piston, working fluid, and housing, thereby increasing efficiency and reducing the working volume of the variable working chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cooling openings are introduced into the housing to cool the piston and working fluid, then the efficiency of the piston engine increases, but the working volume of the variable working chamber is reduced
Solution Approach 1:
The housing is designed with differentiated thermal properties: walls adjacent to the piston are made thermally conductive to enable efficient heat transfer and cooling, while other housing walls maintain insulation to preserve working volume and prevent heat loss to the environment. This localized thermal management allows cooling openings to be strategically positioned only where needed for heat dissipation.
Solution Approach 2:
The housing is segmented into functionally distinct zones: a first housing portion with cooling openings for active cooling of the piston and working fluid, and a second housing portion that maintains insulation and preserves working volume. This segmentation allows the system to simultaneously achieve efficient cooling and maintain adequate working chamber volume.
2Temperature
If the piston is cooled by introducing cooling fluid through cooling openings, then the temperature of the piston and working fluid is reduced, but the working volume of the variable working chamber is reduced
Solution Approach 1:
Thermal management is applied locally rather than globally: cooling openings are positioned only in housing walls adjacent to the piston where heat generation occurs, while other housing walls maintain insulation. This localized cooling approach reduces piston temperature effectively while minimizing the impact on overall working chamber volume.
Solution Approach 2:
A thermally conductive intermediate structure (the housing wall portion) is introduced between the cooling fluid and the piston, allowing efficient heat transfer from the piston to the cooling fluid while maintaining the structural integrity and volume of the working chamber. The housing acts as a heat exchanger that mediates thermal energy removal without significantly encroaching on working volume.
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 cooling system enhances the piston engine's efficiency by effectively removing heat, improving performance, and allowing for higher pressure operations without the need for oil, making it suitable for use as vacuum pumps, compressors, or expansion motors.
Implementation Method 1
at least for the convective cooling of one side of the piston opposite the first working surface by means of a cooling fluid
Data Source
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AI summary
The application relates to a piston engine comprising: - a housing with a chamber having a substantially circular sector-shaped cross-section, - a pivotable piston designed as a pivoting element and arranged in the housing with a first working surface, wherein the housing and the piston define at least one first variable working chamber, - a drive or output connected to the piston, and - an outlet arranged in the working chamber for venting a working fluid. The housing has a cooling opening in at least one housing wall to the chamber for at least convective cooling of one side of the piston opposite the first working surface by means of a cooling fluid.