Rotary Heat Engine with Rolling Diaphragm and Direct Piston Coupling
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Solution Overview
Problem
Current heat engines face inefficiencies due to the need for circulating pumps, fluctuating temperatures, and stress-induced losses from piston movement, particularly in maintaining refrigerant state and heat transfer control in Sterling Engine topologies.
Innovation Solution
A rotary heat engine design featuring a central crankshaft with offset piston attachment members, rolling diaphragms, and a heat exchanger configuration that minimizes liquid refrigerant passage and optimizes heat transfer through material conductivity and insulation, allowing for efficient energy conversion from temperature differences without external pumps or combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circulating pump is used to move working fluid in conventional heat engines, then the working fluid can be circulated between heat exchangers, but the device complexity and energy consumption increase
Solution Approach 1:
The working fluid automatically circulates between the hot and cold heat exchangers driven by temperature-induced density differences and phase changes, eliminating the need for external pumps. The system serves itself through natural convection and thermodynamic cycles.
Solution Approach 2:
The mechanical circulating pump is replaced with a thermally-driven fluid circulation system using phase change and density differential. The mechanical energy input is substituted with thermal energy utilization.
2Temperature
If liquid refrigerant is allowed to pass into the cylinder, then heat transfer may improve, but the refrigerant state becomes unstable and mechanical stress increases
Solution Approach 1:
The system separates the heat exchanger into distinct hot and cold sections, with the hot heat exchanger positioned to prevent liquid refrigerant migration into the cylinder. The connecting pipe geometry segments the refrigerant flow path to maintain phase separation.
Solution Approach 2:
The connecting pipe acts as an intermediary element between the heat exchanger and cylinder, designed with specific geometry to allow vapor passage while blocking liquid refrigerant. The pipe serves as a phase-selective conduit.
3Power
If piston movement with connecting rods is used, then mechanical energy conversion is achieved, but stress and energy loss increase
Solution Approach 1:
The connecting rod and piston pin components are extracted from the system. The piston is directly coupled to the crankshaft, eliminating the intermediate connecting rod mechanism that causes stress and energy loss.
Solution Approach 2:
Instead of using a conventional piston-connecting rod-crankshaft mechanism, the invention inverts the approach by directly coupling the piston to the crankshaft, reversing the traditional mechanical energy transmission path.
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 design enhances mechanical energy conversion efficiency by reducing stress and maintaining refrigerant in a gaseous state, improving heat transfer control, and eliminating the need for circulating pumps, thereby increasing overall efficiency and reducing operational stress.
Implementation Method 1
The Heat Engine described can harness heat from conduction, convection, and/or radiation.
Implementation Method 2
The Heat Engine described can harness heat from conduction, convection, and/or radiation.
Implementation Method 3
The Heat Engine described can harness heat from conduction, convection, and/or radiation.
Implementation Method 4
a rolling diaphragm that moves back and forth in response to temperature differences
Data Source
AI summary
A rotary heat engine including a central crankshaft and a plurality of cylinder assemblies and a heat exchanger assembly. At least one of the plurality of cylinders, and preferably all of the plurality of cylinders includes a cylinder member, a piston member slidably positionable within the cylinder member, a connecting rod and a rolling diaphragm. The rolling diaphragm is positioned between the piston and the cylinder assembly to define a working volume which is in fluid communication with an opening that is in communication with the heat exchanger body.