Linear Compressor Cylinder Recesses to Prevent Piston Collision
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Solution Overview
Problem
Linear compressors face issues with piston and cylinder collisions due to reduced pressure differences, leading to unstable support and potential mechanical failures.
Innovation Solution
The design incorporates a cylindrical shape with strategically positioned recesses and supply ports on both the cylinder and piston, varying in shape and size to maintain a minimum gap and prevent collisions, thereby stabilizing the piston's support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the piston reciprocates at high speed in the cylinder, then the compression efficiency is improved, but the gap between the piston and cylinder is reduced leading to collision
Solution Approach 1:
The recesses are formed in advance on the inner circumferential surface of the cylinder at specific positions where the piston makes contact during reciprocation. This preliminary structural preparation ensures that when the piston reaches high speeds, the recesses are already in place to prevent collision, allowing high-speed operation without compromising reliability.
Solution Approach 2:
Instead of uniformly increasing the gap between piston and cylinder throughout, recesses are strategically formed only at specific local positions on the inner circumferential surface where contact occurs during reciprocation. This localized modification prevents collision at critical points while maintaining overall compression efficiency.
2Reliability
If the gap between piston and cylinder is increased to prevent collision, then reliability is improved, but the compression space is reduced affecting efficiency
Solution Approach 1:
The recesses are pre-formed on the cylinder's inner surface at the exact positions where piston contact occurs during reciprocation. This preliminary structural preparation allows the piston to maintain a consistently safe distance without requiring a uniform gap increase, thus preventing collision while preserving compression space and efficiency.
Solution Approach 2:
Rather than increasing the gap uniformly throughout the entire cylinder-piston interface, recesses are created only at specific local positions on the inner circumferential surface where contact actually occurs. This localized approach prevents collision at critical points while minimizing impact on the overall compression space.
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 the reliability of the linear compressor by preventing collisions and ensuring stable support, improving the compressor's operational efficiency and reducing mechanical stress.
Implementation Method 1
a difference between pressures of an upper part and a lower part of the piston in a front area of the piston decreases, a levitation force of the piston relative to a cylinder is weakened
Data Source
AI summary
A linear compressor includes a cylinder that defines a compression space of a refrigerant and has a cylindrical shape, and a piston disposed in the cylinder and reciprocating along an axis of the cylinder. The cylinder includes a supply port radially passing through the cylinder, and a recess formed on an inner circumferential surface of the cylinder and communicating with the supply port. The supply port includes a first supply port and a second supply port disposed in a rear of the first supply port, and the recess includes a first recess and a second recess disposed in a rear of the first recess. The first recess and the second recess are formed in different shapes.