Single-Cylinder Stirling Engine With Internal Heat Exchangers
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Solution Overview
Problem
Existing Stirling engines face issues with low thermal conductivity due to material and strength design of the cylinder, leading to slow heat conduction and low power output, and structural complexity that complicates installation and application scenarios.
Innovation Solution
A single cylinder internally heated Stirling engine design with integrated heat exchangers inside the cylinder and a simplified piston-transmission mechanism, utilizing a single piston with a gas valve and pipeline connections for media circulation, enhancing thermal conductivity and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external heat source directly heats the cylinder wall, then thermal power is improved, but structural strength deteriorates due to high temperature stress
Solution Approach 1:
The cylinder is divided into hot side cylinder and cold side cylinder sections, with the heat exchanger separately positioned inside the hot side cylinder. This segmentation allows the heating function to be isolated from the main cylinder wall, protecting the cylinder structure from direct high temperature stress while maintaining thermal power.
Solution Approach 2:
A heat exchanger is introduced as an intermediary component between the external heat source and the working gas. The heat exchanger receives heat from the external source and transfers it to the working gas through heat conduction, preventing direct heating of the cylinder wall and preserving structural strength while maintaining thermal power.
2Power
If traditional two cylinder piston system is used, then heating and cooling functions are achieved, but device complexity increases
Solution Approach 1:
The hot side cylinder and cold side cylinder are joined together to form a single integrated cylinder assembly. The single piston integrates both heating and cooling functions within one cylinder, eliminating the need for separate cylinders and reducing overall system complexity while maintaining the necessary thermal functions.
Solution Approach 2:
The single piston serves multiple functions: it separates the hot and cold sides, controls gas flow between them, and converts thermal energy differences into mechanical work. The cylinder assembly simultaneously provides both heating and cooling chambers, reducing the number of components needed.
3Power
If heat insulation ring is added between hot and cold sides, then thermal efficiency is improved, but device complexity increases
Solution Approach 1:
Heat insulation is applied locally at the interface between the hot side cylinder and cold side cylinder using a heat insulation ring. This localized insulation approach improves thermal efficiency by preventing heat leakage between hot and cold sides without requiring complete redesign of the entire cylinder structure.
Solution Approach 2:
The heat insulation ring creates a clear segmentation between the hot and cold thermal zones within the single cylinder. This segmentation allows independent thermal management of each side while maintaining a unified mechanical structure, improving efficiency without excessive complexity.
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 design achieves higher thermal power, better pressure resistance, simplified structure, and expanded application scenarios by integrating heat exchangers within the cylinder and replacing traditional mechanisms with a single piston-transmission system.
Implementation Method 1
a first heat exchanger, which is arranged inside the hot side cylinder and is in fluid communication with an external heat source, and used for heating the working gas in the hot side cylinder
Implementation Method 2
a second heat exchanger, which is arranged inside the cold side cylinder and is in fluid communication with an external cold source, and used for cooling the working gas in the cold side cylinder
Implementation Method 3
a heat insulation ring is provided between the hot side cylinder and the cold side cylinder
Implementation Method 4
The hot side cylinder expands under the heating of an external heat source, applies external work, and drives the piston of the hot side cylinder to move
Implementation Method 5
the working gas in the two cylinders is connected through channels of a regenerator. The gas medium in the cold side cylinder is compressed under the driving of the flywheel
Data Source
AI summary
The present application relates to a single cylinder internally heated Stirling engine, comprising: a cylinder assembly comprising a hot side cylinder and a cold side cylinder, which are joined together to form a closed single cylinder, and a heat insulation ring is provided between them; a first heat exchanger arranged inside the hot side cylinder and in fluid communication with an external heat source, used to heat the working gas in the hot side cylinder; a second heat exchanger arranged inside the cold side cylinder and in fluid communication with an external cold source, used to cool the working gas in the cold side cylinder; a piston, installed in the cylinder assembly and provided with a gas-flow channel and a gas valve; and a piston rod, one end fixed to the piston and the other end connected to a transmission mechanism located outside the cylinder.