Linear Compressor Diaphragm Coupling Friction Reduction
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Solution Overview
Problem
Linear compressors in refrigerator appliances face inefficiencies due to friction between the piston and the cylinder wall, and the presence of multiple air gaps disrupts the magnetic field, making it difficult to maintain uniformity and efficiency.
Innovation Solution
A linear compressor design with a compliant coupling between the inner back iron assembly and the piston, and a single air gap between the magnet and the driving coil, which reduces friction and maintains a uniform magnetic field by using a machined spring and compliant couplings to manage motion and reduce side pull forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a piston is used in a linear compressor, then refrigerant compression is achieved, but friction between the piston and cylinder wall reduces efficiency
Solution Approach 1:
The patent extracts and removes the problematic friction interface by eliminating the traditional piston-cylinder wall contact. Instead of using a piston that rubs against the cylinder wall, the invention uses a diaphragm that seals against the cylinder head, completely removing the source of friction losses while maintaining the compression function.
Solution Approach 2:
The patent replaces the mechanical piston-cylinder friction-based compression system with a diaphragm-based compression system. The diaphragm is actuated by a linear motor to compress the refrigerant, substituting the problematic mechanical contact system with a non-contacting alternative that eliminates friction.
2Adaptability or versatility
If multiple air gaps are provided in the magnetic field path, then magnet mounting flexibility is improved, but magnetic field transmission is interrupted
Solution Approach 1:
The patent merges the back iron and piston into a single integrated component. This eliminates the air gap between these two parts, creating a continuous magnetic path that improves magnetic field transmission while maintaining the structural integrity and functionality of both components.
Solution Approach 2:
The integrated back iron-piston component serves multiple functions: it provides the magnetic path continuity needed for efficient field transmission, maintains the structural support function of the back iron, and performs the compression function of the piston, thereby eliminating the need for separate components and the air gap between them.
3Productivity
If a piston-cylinder configuration is used, then compression function is achieved, but alignment difficulties increase friction
Solution Approach 1:
The patent extracts and eliminates the alignment problem by removing the piston component entirely. The diaphragm-based system does not require the precise alignment between piston and cylinder wall that plagues traditional piston designs, as the diaphragm seals against the cylinder head rather than sliding along the cylinder wall.
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 design enhances the efficiency of the linear compressor by minimizing friction and maintaining a consistent air gap, leading to improved performance and reduced energy losses.
Implementation Method 1
The driving coil receives a current that generates a force for sliding the piston forward and backward within a chamber
Implementation Method 2
A compliant coupling extends between the inner back iron assembly and the piston
Data Source
AI summary
A linear compressor is provided. The linear compressor includes a piston slidably received within a chamber of a cylinder assembly and a mover positioned in a driving coil. The linear compressor also includes features for coupling the piston to the mover such that motion of the mover is transferred to the piston during operation of the driving coil and for reducing friction between the piston and the cylinder during motion of the piston within the chamber of the cylinder.