Oil-Injected Screw Compressor Dual Cooling Control
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Solution Overview
Problem
Screw air compressors face inefficiencies in energy consumption due to challenges in maintaining optimal compressed air temperatures, leading to condensation of water vapor and reduced operational efficiency across varying environmental conditions.
Innovation Solution
An oil-injected screw air compressor with two oil cooling devices and a control unit dynamically adjusts the temperature of lubricating oil based on measured pressure, temperature, and humidity data to maintain compressed air temperatures above the dew point, ensuring isothermal compression conditions year-round.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single oil cooling device is used, then the structure is simple, but the temperature control precision is insufficient to prevent condensation under varying environmental conditions
Solution Approach 1:
The single oil cooling device is divided into two separate oil cooling devices, each independently controlling the temperature for different compression stages. This segmentation allows precise temperature control for each stage, preventing condensation under varying environmental conditions while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent implements dynamic temperature control by using sensors to detect environmental conditions and compressor operating parameters, then dynamically adjusting the cooling degree of each oil cooling device. This dynamic adjustment ensures the compressed air temperature remains above dew point across different environmental conditions, resolving the contradiction between control precision and system complexity
2Temperature
If aggressive cooling is applied to reduce oil temperature, then lubrication effectiveness improves, but compressed air temperature drops below dew point causing condensation
Solution Approach 1:
The patent applies different cooling degrees to different compression stages through separate oil cooling devices. The first oil cooling device provides stronger cooling for the high-temperature first stage compression, while the second oil cooling device provides milder cooling for the second stage. This localized differential cooling maintains lubrication effectiveness while preventing the compressed air temperature from dropping below dew point
Solution Approach 2:
The control unit receives feedback from sensors monitoring environmental conditions, compressed air temperature, and oil temperature. Based on this feedback, the control unit dynamically adjusts the operation of each oil cooling device to maintain optimal temperatures, preventing both overheating and condensation. This closed-loop feedback system resolves the contradiction by continuously balancing cooling effectiveness with condensation prevention
3Use of energy by moving object
If isothermal compression is maintained year-round, then energy efficiency improves, but the system becomes highly sensitive to environmental condition variations
Solution Approach 1:
The patent implements a dynamic control system that continuously adapts to environmental conditions. Sensors detect temperature, humidity, and pressure variations, and the control unit adjusts the cooling degree of each oil cooling device in real-time. This dynamic adaptability maintains near-isothermal compression conditions for energy efficiency while automatically adjusting to seasonal and environmental variations, resolving the contradiction between energy efficiency and environmental adaptability
Data Source
Figure 1
AI summary
An oil-injected screw air compressor (100) includes a first stage compression chamber (130), an air buffering chamber (140) coupled to the first stage compression chamber (130), a second stage compression chamber (150) coupled to the air buffering chamber (140), a first oil cooling device (230) for cooling lubricating oil for the first stage compression chamber (130) and the air buffering chamber (140), a second oil cooling device (430) for cooling lubricating oil for the second stage compression chamber (150) and the first oil cooling device (230), a plurality sensors (132, 142, 152) respectively located at the first stage compression chamber (130) outlet and the second stage compression chamber (150) outlet, and a control unit (300) respectively and dynamically controlling the first oil cooling device (230) and the second oil cooling device (430) according to preset pressure and temperature data measured by the sensors (132, 142, 152) or pressure and temperature data measured by the sensors (132, 142, 152), and temperature data and humidity data of an environment. The first oil cooling device (230) and the second oil cooling device (430) are connected in series.