Air Compressor Cooler Clogging Detection Using Bearing Temperature Difference
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Solution Overview
Problem
Existing methods for estimating cooler clogging in air compressors are inaccurate and costly, particularly when multiple coolers are involved, and periodic cleaning schedules lead to inefficiencies and increased costs.
Innovation Solution
The air compressor separates cooler and motor cooling paths, using existing temperature sensors to detect the temperature difference between motor bearings to estimate cooler clogging, recommending cleaning when the difference falls below a threshold, thus avoiding additional sensor costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic cleaning is performed based on fixed schedules, then maintenance is ensured, but operating efficiency decreases due to excess work and increased costs
Solution Approach 1:
The invention changes the cleaning schedule from a fixed time-based parameter to a condition-based parameter. The controller monitors the temperature difference between motor bearings in real-time and dynamically determines cleaning timing based on actual cooler clogging status. When the temperature difference exceeds a threshold indicating clogging, cleaning is triggered; otherwise, normal operation continues. This parameter transformation enables maintenance only when actually needed, improving operating efficiency while ensuring reliability.
2Productivity
If cleaning timing is delayed, then operating costs decrease, but compressor performance deteriorates due to temperature rise and increased power consumption
Solution Approach 1:
The invention implements a feedback mechanism where the controller continuously monitors the temperature difference between the load-side and anti-load-side motor bearings. This temperature difference serves as an indicator of cooler clogging status. When the temperature difference exceeds a predetermined threshold, the controller generates a cleaning notification. This closed-loop feedback system ensures the compressor maintains optimal performance by triggering cleaning at the precise moment cooling efficiency deteriorates, avoiding both premature and delayed cleaning.
3Measurement precision
If additional sensors are added to detect cooler clogging accurately, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The invention makes the existing motor bearing temperature sensors serve a dual function: their primary function of monitoring motor bearing temperature for protection is maintained, and they simultaneously function to detect cooler clogging status. By monitoring the temperature difference between the two motor bearings, the system achieves accurate cooler clogging detection without adding any sensors. This multi-functionality approach improves measurement precision for clogging detection while avoiding increased device complexity and cost.
4Measurement precision
If manual inspection is performed frequently to ensure accurate cleaning timing, then measurement precision improves, but loss of time and labor increase
Solution Approach 1:
The invention enables the air compressor system to self-monitor its own cooling status through automated temperature difference measurement between motor bearings. The controller continuously compares the temperatures and automatically determines when cleaning is needed without human intervention. This self-service capability eliminates the need for manual inspection, reducing labor time and costs while maintaining high measurement precision for cleaning timing determination.
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
Accurately recommends cooler cleaning at the appropriate time, reducing costs and maintaining efficiency by utilizing existing sensors to detect cooler clogging.
Implementation Method 1
an air cooler that cools the air compressed by the compressor body, the motor and the compressor body
Implementation Method 2
external air is sucked in through a cooler intake port in the chassis to cool the cooler
Implementation Method 3
a first sensor that detects the temperature of the bearing on the load side of the motor and a second sensor that detects the temperature of the bearing on the anti-load side of the motor
Data Source
AI summary
To provide a packaged air-cooled air compressor capable of recommending cooler cleaning at the proper timing while controlling cost increase. The package-type, air-cooled air compressor has two cooling paths to the air-cooled cooler and motor, two cooling air intake ports where these cooling paths take in outside air, a fan and outlet that collectively exhaust cooling air after cooling the cooler and motor to the outside, and a bearing located at both ends of the motor shaft. The controller calculates the temperature difference between the bearings located upstream (anti-load side) and downstream (load side) of the motor shaft in the cooling air flow direction, and determines that the cooler is clogged if the temperature difference is less than a threshold value.