Centrifuge Rotor Cooling with Variable-Speed Compressor
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Solution Overview
Problem
Conventional centrifuges face challenges in maintaining efficient temperature control, especially at high ambient temperatures, due to the limitations of ON-OFF compressor control, which leads to inefficient operation, potential overheating, and restricted usage outside the specified temperature range.
Innovation Solution
A centrifuge with a variable-speed compressor and an inverter-controlled cooling system that adjusts the compressor's rotation frequency based on ambient temperature, allowing for continuous operation within a set range and providing users with alternative operation conditions to ensure stable and efficient temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ON-OFF compressor control is used, then the cooling system is simple to operate, but the compressor overheats and temperature control becomes inefficient at high ambient temperatures
Solution Approach 1:
The patent applies dynamic speed control to the compressor by using an inverter to vary the rotation frequency continuously based on ambient temperature conditions. Instead of fixed ON-OFF control, the compressor operates at optimized speeds across different temperature ranges, preventing overheating while maintaining efficient temperature control. This dynamic adjustment resolves the contradiction by making the control system adaptive rather than static.
Solution Approach 2:
The patent changes the operational parameters of the compressor by adjusting rotation frequency based on ambient temperature. The control system selects different rotation frequencies from predetermined values according to temperature conditions, transforming the control approach from binary ON-OFF to continuous parameter adjustment. This resolves the contradiction by enabling the compressor to operate within safe temperature limits while maintaining simplicity through automated parameter selection.
2Productivity
If the compressor rotation frequency is increased to improve cooling efficiency, then the cooling performance improves, but the compressor temperature increases and may exceed upper limits
Solution Approach 1:
The patent uses dynamic speed adjustment to optimize the balance between cooling efficiency and compressor temperature. The inverter controls the compressor to operate at different rotation frequencies based on real-time temperature conditions, allowing high-speed operation when cooling demand is high but preventing excessive temperature buildup. This dynamic control resolves the contradiction by making the system adaptive to changing conditions.
Solution Approach 2:
The patent implements a feedback control mechanism where the control system monitors ambient temperature and selects appropriate compressor rotation frequencies from predetermined values. This feedback loop ensures that the compressor operates at optimal speeds that provide sufficient cooling while preventing overheating, resolving the contradiction between cooling efficiency and temperature control through continuous monitoring and adjustment.
3Temperature
If the compressor operates continuously at high speed to maintain low temperature, then the rotor temperature control is effective, but energy consumption increases
Solution Approach 1:
The patent changes the compressor operation mode from continuous high-speed operation to variable-speed operation based on ambient temperature conditions. The control system selects from predetermined rotation frequencies that are optimized for different temperature ranges, reducing energy consumption when full cooling capacity is not needed while maintaining effective rotor temperature control when required.
Solution Approach 2:
The patent applies partial action by operating the compressor at reduced rotation frequencies when ambient temperatures are moderate, providing just enough cooling to maintain rotor temperature within specifications. This avoids the excessive energy consumption of continuous high-speed operation while still achieving the required temperature control through optimized partial-load operation.
4Reliability
If the centrifuge is designed to operate within a restricted temperature range (15°C to 25°C), then the temperature control reliability is ensured, but the adaptability to different environments is reduced
Solution Approach 1:
The patent makes the centrifuge adaptable to different ambient temperatures through dynamic control of the compressor speed. Instead of being restricted to a fixed temperature range, the system automatically adjusts compressor rotation frequency based on ambient conditions, allowing reliable operation across a broader temperature spectrum while maintaining rotor temperature within specifications through adaptive control.
Solution Approach 2:
The patent changes the operational parameters of the cooling system to adapt to different ambient temperatures. The control system selects from predetermined rotation frequencies based on measured ambient temperature, enabling the centrifuge to maintain reliable temperature control across expanded environmental conditions rather than being limited to a restricted range.
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 enables stable and efficient temperature control, prevents compressor overheating, and allows for continued operation even outside the standard temperature range, enhancing energy efficiency and user flexibility.
Implementation Method 1
a compressor (7b) of variable-speed control type
Implementation Method 2
a condenser (7a) and a compressor (7b)
Implementation Method 3
a copper pipe (7c) as an evaporator is wounded in a spiral shape
Implementation Method 4
cooling the rotor chamber (3) by flowing a refrigerant in a pipe wrapped around an outer circumference portion of the rotor chamber bowl (2)
Implementation Method 5
a cooling device of variable-speed-control type such as inverter control for cooling the rotor chamber (3)
Data Source
AI summary
A centrifuge including a temperature sensor measuring ambient temperature is provided. Centrifugation operation is available or not is determined in accordance with a type of a rotor, the ambient temperature, or operation conditions set by a user. When it is inoperable, a display device displays that it is inoperable so as to invite the user to select necessity of modification of the operation conditions. Upon the display, modified operation conditions which are candidates of operable operation conditions are displayed to let the user select a candidate. To operate under the selected setting operation conditions, the display device displays that the operation is working under modified conditions.