Alpha Stirling Engine Twin Cylinders for Reduced Piston Strain
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Solution Overview
Problem
Stirling engines face challenges in durability due to high working pressures and strain on components, particularly the pistons and connected parts, which compromise power output.
Innovation Solution
The introduction of twin cylinders in the expansion and compression cylinders, each with reduced piston area, maintains power output while reducing the force on each piston, thereby alleviating strain on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of cylinders is increased to reduce force on each piston, then durability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing a single large-cylinder design into multiple smaller cylinders (twin cylinder arrangement). Each cylinder handles a portion of the total power output, reducing the force and stress on individual pistons and components. This segmentation improves durability by distributing mechanical loads across multiple smaller units rather than concentrating them in a single large unit.
2Strength
If the piston area is reduced in twin cylinders to reduce force on pistons, then component strain is reduced, but power output may be compromised
Solution Approach 1:
The patent merges the output of multiple smaller cylinders to achieve the total required power output. While each individual piston in the twin cylinder arrangement experiences reduced force due to smaller piston area, the combined power output of both cylinders equals or exceeds that of a single large cylinder. This merging approach maintains overall system power while protecting individual components from excessive stress.
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 enhances durability by distributing the required force, ensuring high power output without compromising component integrity.
Implementation Method 1
Stirling engines are external, closed-cycle engines which use an external heat source to expand a working gas which drives one or more pistons
Implementation Method 2
the cold cylinder is situated inside or connected to the low temperature heat exchanger
Implementation Method 3
Stirling engines in combination with a thermal energy storage can be used to utilize excess power
Data Source
AI summary
An alpha type Stirling engine is provided and comprises an expansion cylinder and a compression cylinder. The Stirling engine further comprises a regenerator, a cooler, a heater, and a gas channel which provides the expansion cylinder in fluid communication with the compression cylinder. At least one of the expansion cylinder and the compression cylinder has a twin cylinder which functions as an additional expansion cylinder or an additional compression cylinder, respectively, wherein the one of the expansion cylinder and the compression cylinder that has a twin cylinder, is together with said twin cylinder connected to a first portion of the gas channel, from which the first portion of the gas channel extends via the regenerator to a second portion to which the other one of the expansion cylinder and the compression cylinder is connected.