Centrifuge having a compressor cooling device, and method for controlling a compressor cooling device of a centrifuge
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Solution Overview
Problem
Existing centrifuge compressor cooling devices suffer from limited control precision, high vibrations, and inefficient heat dissipation, leading to temperature fluctuations and reduced service life, especially in low-load conditions.
Innovation Solution
Incorporating a controllable throttle device, such as an electronic injection valve, into the refrigeration cycle of the compressor cooling device allows for precise external control of refrigerant flow, reducing vibrations and enabling full evaporator surface utilization, thus enhancing cooling efficiency and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermostat controlled injection valve is used for automatic refrigerant flow control, then temperature control is improved, but control precision deteriorates due to superheating requirements
Solution Approach 1:
The patent replaces the mechanical thermostat controlled injection valve with an electronically controlled injection valve that uses a control circuit to directly regulate refrigerant flow based on temperature sensor feedback, eliminating the need for mechanical superheating mechanisms and achieving more precise control
Solution Approach 2:
The patent implements a feedback control system where temperature sensors monitor the actual temperature and the control circuit adjusts the injection valve opening accordingly, creating a closed-loop system that maintains precise temperature control without requiring superheating margins
2Power
If the compressor is configured for highest load case with capillary tube or thermostat injection valve, then maximum cooling capacity is achieved, but control adaptability deteriorates for partial load cases
Solution Approach 1:
The patent makes the injection valve dynamically adjustable through electronic control, allowing the refrigerant flow to be continuously modified based on actual cooling demands, enabling the system to adapt efficiently from full load to partial load conditions while maintaining optimal performance
Solution Approach 2:
The patent changes the control parameter from fixed mechanical settings to variable electronic control signals, allowing the injection valve opening degree to be adjusted continuously according to operating conditions, thereby achieving both high capacity and good adaptability
3Stress or pressure
If superheating is required for positive pressure generation in thermostat injection valve, then pressure control is improved, but evaporator performance deteriorates due to unused evaporator surface
Solution Approach 1:
The patent replaces the mechanical pressure-generation-through-superheating mechanism with an electronic control system that directly regulates injection valve opening to maintain desired pressure and temperature, eliminating the need for unnecessary superheating and maximizing evaporator utilization
4Power
If frequency controlled compressor is used for partial load control, then power control is improved, but vibration increases and service life deteriorates
Solution Approach 1:
The patent introduces the electronically controlled injection valve as an intermediary device that handles partial load regulation by adjusting refrigerant flow, allowing the compressor to operate at optimal speeds while the injection valve provides fine-tuned flow control, thereby reducing vibrations and extending compressor life
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 solution provides improved control precision, reduced vibrations, increased cooling power, and extended compressor service life by allowing for precise temperature regulation and efficient heat dissipation, even in low-load conditions, while minimizing energy consumption.
Implementation Method 1
an evaporator (3) which is configured for indirect cooling of the centrifuge bowl (5)
Implementation Method 2
a refrigerant goes through phase changes when going through the refrigeration cycle, typically from liquid to gaseous
Implementation Method 3
a compressor (7), a condenser (9) and an expansion element (11)
Implementation Method 4
a condenser (9) and an expansion element (11)
Implementation Method 5
an expansion element (11) configured for the highest load case
Data Source
AI summary
The present invention relates to a centrifuge having a compressor cooling device and it also relates to methods for controlling a compressor cooling device of a centrifuge. The centrifuge according to the invention has a controllable throttle device in the refrigeration cycle of the compressor cooling device.