Oil-Fed Air Compressor Oil Deterioration Detection via Stable Pressure Drop
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Solution Overview
Problem
The determination accuracy of oil deterioration in oil feed type air compressors is low due to fluctuations in oil flow rates caused by the temperature control valve's diversion ratios, affecting the pressure difference sensed by pressure sensors.
Innovation Solution
Incorporating a controller that estimates the diversion ratios for the oil cooler and bypass pipe based on temperature sensors' readings, allowing for accurate computation of the pressure difference between upstream and downstream pressure sensors to determine oil deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure sensors are used to determine oil deterioration state, then oil replacement timing can be determined dynamically, but determination accuracy becomes low due to flow rate fluctuations caused by temperature control valve
Solution Approach 1:
The system dynamically adjusts the temperature control valve to set diversion ratios based on oil temperature, creating stable flow conditions for accurate pressure measurement. The controller continuously monitors temperature and adjusts the valve to maintain optimal flow stability for the pressure sensors to accurately determine oil deterioration state.
Solution Approach 2:
The system changes the operational parameters of the temperature control valve (diversion ratio) based on oil temperature conditions. By adjusting the diversion ratio to specific values at different temperatures, the system optimizes flow stability to ensure accurate pressure difference measurements for oil deterioration determination.
2Temperature
If diversion ratio for oil cooler increases, then oil cooling effect improves, but flow rate at pressure sensor position decreases causing pressure difference fluctuation
Solution Approach 1:
The system dynamically adjusts the diversion ratio based on real-time oil temperature measurements. The controller monitors oil temperature and continuously optimizes the diversion ratio to balance cooling effectiveness with flow stability, ensuring that pressure sensors can accurately measure pressure differences for oil deterioration determination.
Solution Approach 2:
The system uses feedback from temperature sensors to adjust the temperature control valve's diversion ratio. This closed-loop control ensures that the diversion ratio is optimized for both cooling performance and flow stability, maintaining accurate pressure measurements for oil deterioration assessment.
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 increases the accuracy of oil deterioration state determination by stabilizing the flow rate at specific diversion ratios, enabling timely oil replacement.
Implementation Method 1
an oil cooler that cools the oil
Implementation Method 2
a temperature control valve that adjusts a diversion ratio for the oil cooler and a diversion ratio for the bypass pipe according to a temperature of the oil
Implementation Method 3
a first pressure sensor that is located in the oil feeding system and senses a pressure of the oil, a second pressure sensor that is located on a downstream side of the first pressure sensor in the oil feeding system and senses a pressure of the oil
Implementation Method 4
a compressor main body that compresses air while injecting oil into a compression chamber
Implementation Method 5
a separator that separates the oil from compressed air discharged from the compressor main body
Data Source
AI summary
Provided is an oil feed type air compressor which can increase the determination accuracy regarding a deterioration state of oil. An oil feed type air compressor 1 includes a compressor main body 3, a separator 6 that separates oil from compressed air discharged from the compressor main body 3, and an oil feeding system 8 that feeds the oil separated by the separator 6 into a compression chamber of the compressor main body 3. The oil feeding system 8 includes a temperature control valve 20 that adjusts a diversion ratio for an oil cooler 18 and a diversion ratio for a bypass pipe 19 according to a temperature of the oil. The oil feed type air compressor 1 includes pressure sensors 22A and 22B located in the oil feeding system 8, a discharge temperature sensor 11 located on the discharge side of the compressor main body 3, and a controller 9 that computes, when it is estimated that the diversion ratio for the oil cooler 18 is 100% from the temperature sensed by the discharge temperature sensor 11 exceeding a predetermined value Td1, a difference ΔP between the pressure sensed by the pressure sensor 22A and the pressure sensed by the pressure sensor 22B and determines a deterioration state of the oil in reference to the difference ΔP.