Refrigerator adopting linear compressor and control method thereof
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Solution Overview
Problem
Refrigerators with linear compressors generate excessive noise during heavy heating loads due to high vibration frequencies, which resonate with the refrigerator body, causing loud operation noise, especially when the compressor is positioned near the user.
Innovation Solution
A control method that monitors evaporator temperatures and invokes a noise reduction mode by closing the blower and/or air doors to decrease heat exchange, reducing the compressor's inlet and outlet pressures and vibration frequency, thereby minimizing noise. This method involves setting temperature thresholds and adjusting the linear compressor's operation parameters based on ambient and compartment temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the linear compressor operates under heavy heating load conditions, then the cooling effect is improved, but the operation noise increases due to high vibration frequency resonance
Solution Approach 1:
The patent applies dynamics by making the heat exchange amount adjustable based on operating conditions. The control system dynamically adjusts the air door opening degree or blower speed according to evaporator temperature, allowing the system to optimize between cooling performance and noise levels in different operating states, particularly during heavy heating loads when noise becomes problematic
Solution Approach 2:
The patent changes the heat exchange parameter (controlled via air door opening degree or blower speed) to resolve the contradiction. By adjusting these parameters based on evaporator temperature feedback, the system can reduce heat exchange amount during heavy heating loads to lower compressor vibration frequency and noise, while maintaining adequate cooling when needed
2Productivity
If the heat exchange amount between evaporator and compartment is increased, then the cooling performance is improved, but the evaporator temperature becomes too low causing high compressor vibration frequency
Solution Approach 1:
The patent implements feedback control by continuously monitoring evaporator temperature and using this information to adjust the heat exchange amount. When evaporator temperature exceeds a threshold (indicating heavy heating load), the system reduces heat exchange by closing the air door or reducing blower speed, thereby preventing excessive cooling that would cause high vibration frequencies
Solution Approach 2:
The system takes preliminary anti-action by proactively reducing heat exchange before the evaporator temperature becomes excessively low. The control method monitors temperature trends and adjusts heat exchange parameters in advance to prevent the conditions that lead to high vibration frequencies and noise
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 method effectively reduces operation noise by decreasing the heat exchange rate and vibration frequency of the linear compressor, preventing resonance and resulting in a quieter refrigerator operation during heavy heating loads.
Implementation Method 1
linear compressors to work to compress the coolant
Implementation Method 2
heat exchange between the evaporator and a compartment
Implementation Method 3
heat exchange between the evaporator and a compartment
Implementation Method 4
closing a blower of the refrigerator
Data Source
AI summary
Disclosed is a refrigerator adopting a linear compressor and a control method thereof. The method includes: monitoring the temperature of an evaporator of the refrigerator; if the current temperature of the evaporator of the refrigerator is greater than or equal to a first preset temperature threshold, then invoking a noise reduction mode to actively reduce the heat exchange amount between the evaporator and a compartment of the refrigerator until the current temperature of the evaporator of the refrigerator is smaller than or equal to a second preset temperature threshold, and invoking a cooling mode to resume the normal heat exchange between the evaporator and the compartment of the refrigerator, wherein the first preset temperature threshold is higher than the second preset temperature threshold.