Linear compressor
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Solution Overview
Problem
In linear compressors, the high-temperature refrigerant flowing into the discharge cover causes overheating, leading to increased temperatures of the cylinder and piston, which reduces compression efficiency and poses material limitations due to excessive heat absorption.
Innovation Solution
A thermal insulating plenum with low thermal conductivity is integrated into the discharge cover to prevent direct contact with high-temperature refrigerant, reducing heat transfer and maintaining lower temperatures within the compressor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge cover is directly exposed to compressed high-temperature refrigerant, then the refrigerant can flow through the discharge cover efficiently, but the temperature of the discharge cover and connected components increases, reducing compression efficiency and limiting material choices
Solution Approach 1:
A thermal insulating plenum is introduced as an intermediary component between the compressed high-temperature refrigerant and the discharge cover. This plenum prevents direct thermal contact, allowing the refrigerant to flow through the discharge cover while blocking heat transfer to the discharge cover and connected components, thus resolving the contradiction between discharge efficiency and temperature control
Solution Approach 2:
The discharge cover assembly is segmented into multiple functional zones: a refrigerant flow passage for efficient discharge, and a thermal insulation zone with the insulating plenum that separates the hot refrigerant path from the discharge cover structure. This segmentation allows simultaneous optimization of refrigerant flow and thermal isolation
2Object-generated harmful factors
If compressed high-temperature refrigerant flows directly into the discharge cover, then discharge function is achieved, but the temperature of the frame, cylinder, and piston increases, reducing compression efficiency
Solution Approach 1:
The thermal insulating plenum acts as a thermal mediator that allows the compressed refrigerant to be discharged while preventing harmful heat transfer to the frame, cylinder, and piston. By positioning the plenum to contact the inner surface of the discharge cover, it creates a thermal barrier that protects downstream components from overheating, thereby maintaining compression efficiency
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 solution effectively prevents overheating of the discharge cover, cylinder, and piston, enhancing compression efficiency while minimizing material costs by reducing heat transfer and maintaining lower temperatures.
Implementation Method 1
a thermal insulating plenum with low thermal conductivity is integrated into the discharge cover to prevent direct contact with high-temperature refrigerant, reducing heat transfer
Implementation Method 2
at least a part of the compressed refrigerant may function as a gas bearing between the cylinder and the piston to reduce friction
Data Source
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AI summary
Disclosed herein is a linear compressor. The linear compressor includes a cylinder, a frame, and a discharge unit. The discharge unit includes a discharge cover coupled with the frame, a discharge plenum disposed inside the discharge cover to define a plurality of discharge spaces, and an insulating plenum provided in a shape corresponding to an inner surface of the discharge cover to contact the inner surface of the discharge cover.