Refrigerating device and environmental testing apparatus
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Solution Overview
Problem
Refrigerating devices in environmental testing apparatuses and refrigerators face issues with compressor heat generation leading to motor burnout, viscosity decrease, and early deterioration due to continuous operation under harsh conditions, reducing reliability.
Innovation Solution
A refrigerating device with a refrigerating circuit and control system that includes a bypass flow path and adjustable flow rate control portion, allowing for targeted coolant temperature adjustment based on suction side pressure, refrigerating capacity requirements, or coolant amount to prevent excessive heat generation and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor operates continuously under harsh conditions, then the refrigerating capacity is maintained, but the motor generates excessive heat causing burnout, viscosity decrease, and early deterioration
Solution Approach 1:
The patent introduces a bypass flow path that allows coolant to flow directly from the condenser to the evaporator, bypassing the compressor. This intermediary cooling path enables heat removal from the compressor without requiring the compressor to be part of the primary refrigeration cycle, thus reducing compressor temperature and improving reliability while maintaining refrigerating capacity
Solution Approach 2:
The patent segments the refrigeration system into a main flow path (compressor → condenser → expansion portion → evaporator → compressor) and a bypass flow path (condenser → evaporator). This segmentation allows independent control of compressor cooling from the main refrigeration cycle, enabling temperature management without compromising system performance
2Temperature
If the coolant temperature is reduced to cool the compressor, then the compressor temperature decreases, but the compressor may become too cold affecting its operation
Solution Approach 1:
The patent employs a control portion that monitors compressor temperature and adjusts the bypass flow path opening accordingly. When compressor temperature exceeds a predetermined threshold, the control portion opens the bypass flow path to cool the compressor; when temperature is adequate, it closes the bypass flow path. This feedback mechanism prevents over-cooling and maintains optimal compressor operation
Solution Approach 2:
The bypass flow path opening is made dynamically adjustable rather than fixed. The opening degree changes based on real-time compressor temperature conditions, allowing the system to adaptively control cooling intensity and prevent the compressor from becoming too cold, thus maintaining operational stability
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 maintains the compressor temperature within a certain range, preventing excessive heat generation and cooling, thereby enhancing the reliability and longevity of the refrigerating device.
Implementation Method 1
During the evaporation by the evaporator, the coolant takes heat from the surrounding for cooling
Implementation Method 2
The coolant is compressed by the compressor
Implementation Method 3
the coolant is condensed by the condenser
Data Source
AI summary
A refrigerating device includes a refrigerating circuit and a control portion. The refrigerating circuit includes a main flow path in which a compressor, a condenser, an expansion portion, and an evaporator are connected to each other, and a bypass flow path that connects a discharge side of the condenser and a suction side of the compressor, and a flow rate control portion is provided in the bypass flow path. The control portion is configured to set a target temperature of a coolant introduced into the compressor according to a pressure of the coolant on the suction side of the compressor and is configured to change an opening degree of the flow rate control portion such that a temperature of the coolant introduced into the compressor becomes the target temperature. The target temperature when the pressure is high is higher than that when the pressure is low.