Multi-Cylinder Stirling Engine Merging Displacement Pistons
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Solution Overview
Problem
Existing Stirling engines with multiple cylinders face challenges such as increased friction losses and unnecessary moving masses due to the multiplication of components, which hinder efficient operation, especially at low temperatures and small temperature differentials.
Innovation Solution
A multi-cylinder Stirling engine design featuring mirror-symmetrical displacement cylinders with a common piston rod and a common working cylinder or separate working cylinders, where the displacement cylinders share a hot or cold area, reducing the need for multiple piston rods and linear guide bearings, and eliminating the requirement for a flywheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple single-cylinder Stirling engines are arranged in parallel, then the continuous work output is improved, but the friction losses and moving masses are multiplied
Solution Approach 1:
The patent combines multiple displacement cylinders and their pistons into a single integrated engine structure sharing common components (piston rod, linear guide bearing, working cylinder), thereby achieving continuous work output without multiplying friction losses and moving masses that would occur with parallel arrangement of separate engines
2Productivity
If multiple single-cylinder Stirling engines are arranged in parallel, then the continuous work output is improved, but the moving masses are multiplied
Solution Approach 1:
The patent merges multiple displacement cylinders into a single engine structure where pistons are connected by a common piston rod, reducing the total moving mass compared to parallel arrangement of separate engines while maintaining continuous work output through coordinated piston movements
3Device complexity
If a single-cylinder Stirling engine operates, then the structure is simple, but it cannot operate efficiently at low temperatures with small temperature differentials
Solution Approach 1:
The patent employs dynamically coordinated multiple displacement pistons connected by a rigid piston rod, where the pistons move in a coordinated sequence to maintain continuous compression and expansion of the working gas, enabling efficient operation at low temperatures with small temperature differentials while maintaining relatively simple structure
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 reduces friction losses and moving masses, allowing for efficient operation at low temperatures with minimal temperature differentials, ensuring that at least one working piston is always performing work, thereby enhancing the engine's efficiency and reducing installation space.
Implementation Method 1
The temperature differences in the working gas are accompanied by a different expansion of the working gas and thus a pressure wave
Implementation Method 2
The working gas is alternately moved back and forth between these zones and is thus alternately heated and cooled
Implementation Method 3
The working piston can be moved along the working axis 25 by a pressure change in the working gas
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
The invention relates to a two-cylinder Stirling engine with a pair of opposite displacer cylinders (10A, 10B) which are mirror-symmetrical relative to a mirror plane perpendicular to a displacement axis (41), each of the displacer cylinders having a hot zone (12A, 2B) comprising a hot plate, a cold zone comprising a cold plate, and a displacer piston (11A, 1B) movable between these zones along the displacement axis (41), and wherein the displacer pistons of the pair of displacer cylinders are mechanically coupled to each other by a rigid piston rod (40) movable along the displacement axis (41) which forms the common axis (41) of displacement for the displacer pistons (11A, 11B) of the pair of displacer cylinders (figure 3). Fig 3 Noting to translate