Rigid Synchronous Free Piston Generator for Stable Piston Phasing
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Solution Overview
Problem
The low power generation efficiency and stability issues in free piston generators are due to unstable in-cylinder airflow and lack of phase control, leading to incomplete combustion, increased fuel consumption, pollutant emission, and structural safety concerns from piston movement irregularities.
Innovation Solution
A free piston generator based on a rigid synchronous transmission system, featuring two linear generator sets with high-pressure and low-pressure cylinders connected through a rigid synchronous transmission assembly, ensuring stable phase operation of pistons and enhanced energy conversion efficiency through staged compression and expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the crank connecting rod structure is omitted in free piston generator, then mechanical friction is reduced and mechanical efficiency is improved, but the in-cylinder airflow becomes unstable and thermal efficiency is not improved
Solution Approach 1:
The patent introduces a rigid synchronous transmission mechanism as an intermediary device to mediate between the pistons of different cylinders. This transmission mechanism (comprising transmission shafts, gears, or belts) synchronizes the reciprocating motions of pistons, thereby stabilizing the in-cylinder airflow patterns without requiring traditional crank connecting rod structures, thus resolving the contradiction between reduced mechanical friction and maintained airflow stability.
2Device complexity
If the crank connecting rod structure is omitted, then the structure is simplified, but the piston movement phase becomes unstable leading to incomplete combustion and reduced power generation efficiency
Solution Approach 1:
The rigid synchronous transmission acts as a mediator that maintains the simplified structure advantage while ensuring proper piston phasing for complete combustion. The transmission mechanism (gears, belts, or shafts) enforces synchronized piston movements, guaranteeing optimal compression and expansion phases for fuel combustion, thus preserving power generation efficiency without the complexity of crank connecting rods.
3Device complexity
If the piston movement is not constrained, then the structure is simplified, but the piston may cross top dead center or bottom dead center causing wall-impingement and structural safety issues
Solution Approach 1:
The rigid synchronous transmission mechanism serves as both a phase-synchronizing device and a mechanical constraint. Through the interconnected gears, belts, or transmission shafts, the system passively constrains piston movements to remain within safe limits, preventing wall-impingement and structural damage while maintaining overall structural simplicity compared to traditional crankshaft systems.
4Stability of the object's composition
If traditional multi-cylinder engine phase control is used, then stable operation is achieved, but the mechanical structure becomes complex with crankshafts and connecting rods
Solution Approach 1:
The patent employs a simplified rigid synchronous transmission mechanism as an intermediary to achieve piston phase stability. Instead of complex crankshaft assemblies, the invention uses straightforward gear trains, belt-driven systems, or direct shaft connections to synchronize piston movements, thereby achieving stable operation with reduced mechanical complexity compared to traditional multi-cylinder engine architectures.
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 increases thermal and power generation efficiency by maintaining stable piston movement phases, reducing energy losses, and preventing wall-impingement, thereby improving the overall performance and safety of the free piston generator.
Implementation Method 1
a rotor mandrel movably arranged on the shell in a penetrating manner, a stator coil fixedly arranged in the shell and coaxially sleeving the outside of the rotor mandrel... the work characteristics of the free piston internal combustion engine and a linear motor are coupled, so that the chemical energy of the fuel can be directly converted into electrical energy
Implementation Method 2
a rigid synchronous transmission assembly, featuring two linear generator sets with high-pressure and low-pressure cylinders connected through a rigid synchronous transmission assembly
Data Source
AI summary
A free piston generator based on a rigid synchronous transmission system is provided, which belongs to the technical field of power energy. The present disclosure solves the problems of low power generation efficiency and low stability of the existing free piston generator. The free piston generator based on the rigid synchronous transmission system includes a first linear generator set, a second linear generator set, a rigid synchronous transmission assembly, two high-pressure cylinders arranged at two ends of the first linear generator set, and two low-pressure cylinders arranged at two ends of the second linear generator set. The combustion product is firstly subjected to first-stage expansion in the high-pressure cylinder and is then subjected to second-stage expansion in the low-pressure cylinder, which effectively increases the energy utilization in exhaust gas, also increases the expansion work, and further improves the thermal efficiency and the power generation efficiency of the free piston generator. By means of the rigid synchronous transmission assembly, high-pressure pistons and low-pressure pistons are always kept in stable phase operation, so as to avoid the problems of wall-impingement and insufficient pressure of compressed air due to the phase mismatching.