Constant temperature liquid circulation apparatus and temperature adjustment method for constant temperature liquid
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Solution Overview
Problem
Existing constant temperature liquid circulation apparatuses face challenges in pressure equalization during compressor startup, leading to overheating of the load due to prolonged refrigeration circuit downtime, which increases costs and complexity with the need for additional electronic expansion valves and bypass channels.
Innovation Solution
A constant temperature liquid circulation apparatus that uses a single electronic expansion valve with controlled opening angles to manage compressor on/off states and pressure equalization, allowing for efficient temperature adjustment and pressure balancing within the refrigeration circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a bypass channel and second electronic expansion valve are added to speed up pressure equalization, then the pressure equalizing time is reduced, but the device cost and structural complexity increase
Solution Approach 1:
The single electronic expansion valve is designed to perform multiple functions: it serves as the primary expansion valve during normal refrigeration operation and as a pressure equalizing valve when the compressor starts. By controlling the valve opening degree differently during these two modes, the system achieves pressure equalization without requiring a separate bypass channel or second expansion valve, thus reducing device complexity while maintaining fast pressure equalization.
2Stress or pressure
If the compressor is turned off to allow pressure equalization, then the pressure difference is reduced, but the constant temperature liquid temperature rises due to load heat
Solution Approach 1:
The electronic expansion valve performs pressure equalization operation in advance before the compressor starts. By opening the valve to a large opening degree and maintaining it for a preset time, the pressure difference is reduced beforehand, allowing the compressor to start without overload. This preliminary action eliminates the need to turn off the compressor for pressure equalization, thereby maintaining continuous refrigeration and preventing temperature rise of the constant temperature liquid.
3Measurement precision
If the compressor runs continuously for temperature control, then the temperature adjustment precision is maintained, but the compressor cannot start due to overload from great pressure difference
Solution Approach 1:
The electronic expansion valve dynamically adjusts its opening degree based on operational mode. During normal temperature control, it maintains a small opening degree for precise temperature regulation. Before compressor startup, it switches to a large opening degree for pressure equalization. This dynamic adjustment allows the system to achieve both precise temperature control and reliable compressor startup by adapting the valve opening to the specific operational requirement.
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 approach enables stable compressor operation and fine temperature control with reduced pressure differences, preventing overload and achieving efficient temperature adjustments using a simpler circuit configuration without the need for additional valves or channels.
Implementation Method 1
an electronic expansion valve which expands the high-pressure liquid coolant fed from the condenser so as to be a low-temperature low-pressure liquid coolant
Implementation Method 2
an evaporator which evaporates the low-temperature low-pressure liquid coolant fed from the electronic expansion valve by thermal exchange with the constant temperature liquid
Implementation Method 3
an evaporator which evaporates the low-temperature low-pressure liquid coolant fed from the electronic expansion valve by thermal exchange with the constant temperature liquid
Implementation Method 4
a compressor which compresses the coolant in a gaseous state into a high-temperature high-pressure gaseous coolant
Data Source
AI summary
A cooling liquid circulation apparatus comprising a liquid for a circuit which circularly supplies a liquid for adjusting temperature of a load, a refrigeration circuit which adjusts the temperature of the liquid by thermal exchange with a coolant to a set temperature, and a control unit which controls the overall apparatus. A temperature adjustment method by connecting in series and circularly of a circuit to circularly supply the liquid for adjusting temperature to a load and a refrigeration circuit for adjusting the temperature of the liquid with a coolant by heat exchange.