Machine Tool Cooling Control to Prevent Compressor Cycling
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Solution Overview
Problem
Conventional cooling systems for machine tools experience unstable temperature due to repeated compressor on-off cycles, affecting machining accuracy.
Innovation Solution
A cooling system with a controller that maintains the compressor at a minimum frequency and fan rotation speed below maximum when the target temperature difference is smaller than a threshold, ensuring continuous operation and stable coolant temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compressor frequency is regulated down to minimum and turned off when cooling requirement is lowered, then energy consumption is reduced, but the temperature of the cooled fluid becomes unstable
Solution Approach 1:
The compressor is maintained to run continuously at a minimum frequency rather than being turned off, ensuring continuous cooling action. This continuous operation prevents temperature fluctuations in the cooled fluid while still reducing energy consumption compared to high-frequency operation.
Solution Approach 2:
The system dynamically adjusts the compressor frequency to a minimum level and the fan rotation speed to below maximum, creating a flexible operating state that maintains cooling effectiveness while optimizing energy usage and temperature stability.
2Use of energy by moving object
If the compressor is repeatedly turned on and off to match cooling requirements, then energy consumption is reduced, but the compressor operation becomes unstable
Solution Approach 1:
The compressor operates continuously without repeated on-off cycling, maintaining stable operation. The minimum frequency setting ensures the compressor runs smoothly at a low level, improving operational reliability while still achieving energy savings compared to high-frequency operation.
3Use of energy by moving object
If the fan rotation speed is reduced below maximum, then energy consumption is reduced, but the cooling capability may be insufficient for larger temperature differences
Solution Approach 1:
The fan rotation speed is dynamically adjusted to operate below maximum level, creating a flexible operating state that reduces energy consumption while maintaining adequate cooling capability through the continuous operation of the compressor at minimum frequency.
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 prevents compressor cycling, maintaining stable coolant and machine tool temperatures, thereby enhancing machining accuracy.
Implementation Method 1
The heat exchanger is in fluid communication with the gas source and is configured to cool the gas down to a target temperature
Implementation Method 2
The condenser is configured to dissipate heat
Implementation Method 3
The fan is configured to cool the condenser and has a rotation speed
Data Source
AI summary
A cooling system for cooling a machine tool having a machine temperature. The cooling system comprises gas source, refrigeration circulation, fan, and controller. The gas source is configured for providing gas. The refrigeration circulation comprises heat exchanger, compressor, condenser, and expansion valve. The heat exchanger is in fluid communication with the gas source and configured to cool the gas down to target temperature and to provide the gas to the machine tool. The compressor has operation frequency. The fan is configured to cool the condenser and has a rotation speed. The controller is connected to the compressor and the fan. When a target temperature difference that is equal to the machine temperature minus the target temperature is smaller than threshold temperature difference, the controller keeps the operation frequency at minimum frequency and sets the rotation speed to be smaller than a maximum rotation speed.