Free Piston Linear Motor Compressor Stability via Gas Pressure
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Solution Overview
Problem
Existing natural gas compressors face high manufacturing and maintenance costs, mechanical parasitic losses, and limited suitability for applications requiring high-purity fluids due to reliance on reciprocating technology and mechanical or electromagnetic stabilization methods.
Innovation Solution
A Free Piston Linear Motor Compressor (FPLMC) system with a multi-stage dual-acting piston driven by a linear motor, eliminating the need for mechanical or pneumatic springs and electromagnetic coils, and utilizing a control strategy that provides stability through adaptive current output based on position and velocity feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If reciprocating compressor technology with mechanical springs or electromagnetic coils is used to provide stability and returning force, then the piston can be stabilized about a central position, but the device complexity increases and manufacturing costs increase
Solution Approach 1:
The patent removes mechanical springs and electromagnetic coils from the system entirely. Instead of adding stabilization components, the invention uses the compression chambers and gas pressure itself to provide the returning force, extracting the need for separate stabilization mechanisms.
Solution Approach 2:
The compression chambers serve dual functions: they compress the process fluid and simultaneously provide the returning force for the piston. The gas pressure that is being compressed also acts as the spring force, making the system multi-functional and eliminating separate stabilization components.
2Stability of the object's composition
If reciprocating compressor technology with multiple moving parts is used, then the piston can be centered and stabilized, but the manufacturing costs and maintenance costs increase
Solution Approach 1:
The patent eliminates mechanical springs, electromagnetic coils, and other centering mechanisms. The system uses only the essential components needed for compression, removing unnecessary parts that increase manufacturing complexity and cost.
Solution Approach 2:
The system uses its own operating parameters (gas pressure in the compression chambers) to provide the centering and stabilization function. The compressed gas itself serves as the spring, making the system self-sufficient and eliminating the need for external stabilization components.
3Force
If mechanical or pneumatic springs are used to provide returning force, then the piston has stability, but the device complexity and size increase
Solution Approach 1:
The compression chambers perform two functions simultaneously: compressing the process fluid and providing the returning force through gas pressure. This eliminates the need for separate springs or pneumatic devices, reducing overall system size and complexity.
Solution Approach 2:
Instead of mechanical springs, the system uses pneumatic pressure (compressed gas) to provide the returning force. The gas in the compression chambers acts as a pneumatic spring, providing the necessary force without the physical bulk of mechanical spring components.
4Stability of the object's composition
If electromagnetic coils are used to stabilize the linear motor, then the system can be centered, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent removes electromagnetic stabilization coils from the system. Instead of using electromagnetic fields for centering, the system relies on the mechanical and pneumatic properties of the compression chambers and gas pressure to provide stability.
Solution Approach 2:
The invention replaces electromagnetic stabilization mechanisms with a mechanical-pneumatic system based on gas pressure in the compression chambers. This substitution eliminates the need for complex electromagnetic control systems and reduces manufacturing costs.
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 FPLMC reduces manufacturing and maintenance costs, increases durability, and simplifies the compressor design, enabling efficient and stable operation for a wide range of applications, including natural gas vehicle refueling, by eliminating the need for centering forces and reducing complexity.
Implementation Method 1
a linear electric motor positioned to reciprocate the piston
Implementation Method 2
a piston position feedback control system configured to provide adaptive current output as a function of position feedback and/or velocity feedback from the piston
Data Source
AI summary
A linear motor compressor including a compressor housing and a cylinder housing having a plurality of opposing compression chambers. A piston freely reciprocates within the cylinder housing using a linear electric motor. A piston position feedback control system provides adaptive current output as a function of position feedback and/or velocity feedback from the piston and/or the electric motor, to directly power and control the electric motor, wherein the piston reciprocates without assistance from a mechanical spring or other equivalent centering force.