Linear Compressor Dual Piston Stroke Interference
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Solution Overview
Problem
The capacity of linear compressors is limited due to interference between the piston and adjacent components, as well as the limited length of the permanent magnet, restricting the increase of piston stroke and thus the compressor's capacity.
Innovation Solution
The implementation of a moving assembly with a first piston and a second piston that reciprocate in opposite directions, allowing for increased stroke without altering the compressor's size, and adjusting the driving frequency to match the highest resonant frequency for effective anti-phase behavior and two-stage compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the piston stroke is increased to enhance compressor capacity, then the refrigerating capacity is improved, but the piston interferes with adjacent components and the permanent magnet length becomes insufficient
Solution Approach 1:
The single piston system is segmented into two pistons (first piston and second piston) that operate independently within the same cylinder. Each piston has its own compression chamber and valve assembly, allowing them to perform compression cycles simultaneously without interfering with each other's stroke motion, thereby resolving the interference problem while maintaining increased capacity
Solution Approach 2:
The patent transitions from a single-piston single-stage compression system to a dual-piston two-stage compression system operating in parallel within the same spatial envelope. This dimensional change in system architecture allows both pistons to achieve full stroke motion without interference while collectively providing enhanced compression capacity
2Productivity
If the piston stroke is increased to enhance compressor capacity, then the refrigerating capacity is improved, but the permanent magnet length becomes insufficient
Solution Approach 1:
The single permanent magnet is segmented into two separate permanent magnets, each coupled to its respective piston. This segmentation allows each magnet to be optimized for its specific piston's stroke requirements without being constrained by the length limitations of a single oversized magnet, enabling both pistons to achieve full stroke motion independently
Solution Approach 2:
The dual-piston system with two permanent magnets is nested within the same cylinder and motor assembly structure. The second piston and its permanent magnet are positioned to operate within the same spatial envelope as the first piston system, allowing both to achieve full stroke motion without increasing the overall compressor size or requiring longer permanent magnets
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 compressor's capacity by enabling larger stroke and efficient two-stage compression, achieving increased refrigerating capacity with less power consumption.
Implementation Method 1
The permanent magnet 23 may be linearly reciprocated by a mutual electromagnetic force between the outer stator 21 and the inner stator 22
Implementation Method 2
As a refrigerant passes through the suction muffler 30, noise may be reduced
Implementation Method 3
a valve spring 8 provided between the discharge valve 6 and the discharge cover 7, and providing elastic force in an axial direction
Data Source
AI summary
A linear compressor is provided that may include a cylinder, to which a discharge valve may be coupled; a first piston, which may be provided to enable a reciprocating motion in an inside of the cylinder; a second piston, which may be provided to enable a reciprocating motion in an inside of the first piston; a first compression chamber formed between the discharge valve and the first piston; and a second compression chamber formed between the first piston and the second piston. The first piston and second piston may move in opposite directions with respect to each other.