Piston Compressor Oil Compensation for Continuous Refrigeration Output
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Solution Overview
Problem
Conventional piston compressors in refrigeration systems face lubrication issues due to continuous operation, leading to oil depletion and potential damage, and the current practice of completely shutting them off for oil compensation results in discontinuity of output, compromising performance.
Innovation Solution
A set of piston compressors with a fluid connection between crank cases and a control unit that monitors running time, interrupting the operation of individual compressors for predetermined periods to allow oil compensation, ensuring continuous lubrication and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piston compressors are switched off completely for oil compensation, then adequate lubrication is ensured, but the output becomes discontinuous and performance is compromised
Solution Approach 1:
The system divides the compressor fleet into multiple individual units, each capable of independent operation. This segmentation allows the control unit to manage oil compensation on a per-compressor basis rather than shutting down the entire system, thereby maintaining continuous output from other compressors while ensuring adequate lubrication for each individual unit.
Solution Approach 2:
The control unit monitors running time and proactively interrupts compressor operation before oil depletion occurs. By implementing preliminary oil compensation during scheduled interruptions based on monitored running time, the system prevents lubrication failure while maintaining planned continuous operation through coordination of multiple compressors.
2Productivity
If piston compressors run continuously to maintain constant output, then productivity is maintained, but oil depletion occurs leading to compressor damage
Solution Approach 1:
The control unit continuously monitors the running time of each piston compressor and uses this feedback information to determine when oil compensation is needed. This feedback mechanism enables the system to balance continuous operation with periodic maintenance interruptions, preventing oil depletion while maintaining overall productivity through coordinated compressor management.
Solution Approach 2:
The system performs oil compensation in advance before oil depletion causes damage. By monitoring running time and interrupting operation at predetermined intervals, the system proactively replenishes oil levels, preventing compressor damage while minimizing interruptions to overall system productivity.
3Reliability
If all piston compressors are interrupted simultaneously for oil compensation, then adequate lubrication is restored, but output discontinuity increases and performance is compromised
Solution Approach 1:
The control unit manages oil compensation for each piston compressor independently rather than simultaneously interrupting all compressors. This segmented approach ensures that while one compressor receives oil compensation, other compressors continue to operate and produce output, thereby maintaining overall system productivity and output stability.
Solution Approach 2:
The control unit coordinates interruptions in advance, ensuring that oil compensation for multiple compressors occurs at different times. By planning and executing preliminary oil compensation sequentially rather than simultaneously, the system restores adequate lubrication for all compressors while minimizing overall output discontinuity.
Data Source
AI summary
A set of piston compressors (2, 4, 6, 8) for use in a refrigeration system comprises a fluid connection (10) between the crank cases of the piston compressors (2, 4, 6, 8) for allowing oil compensation between said piston compressors (2, 4, 6, 8); and a control unit (12) which in operation monitors the running time of each piston compressor (2, 4, 6, 8) and, in case all piston compressors (2, 4, 6, 8) are running, subsequently interrupts the operation of a respective piston compressor (2, 4, 6, 8) for a predetermined period of time for oil compensation if its running time reaches a predetermined maximum running time.