Compressor Lubrication System Standby Pump Dynamics
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Solution Overview
Problem
Oil flooded screw compressors face a constant load when the separator tank is pressurized, even in standby mode, leading to unnecessary oil supply to rotors and bearings, which can be alleviated by depressurizing the tank, but this results in a lack of lubrication for the rotor bearings when the compressor is idle.
Innovation Solution
A lubrication system with a pump that supplies oil to the rotor bearings via a separate fluid path when the separator tank is depressurized, ensuring continuous lubrication without the need for pressurized oil flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator tank is pressurized to supply oil to the bearing, then oil supply to the bearing is ensured, but the compressor experiences constant load even in standby mode
Solution Approach 1:
The system dynamically switches between two oil supply modes: during operation, the separator tank pressure supplies oil to both rotors and bearings; during standby, a pump activates to supply oil only to bearings while the separator tank is depressurized. This dynamic adaptation resolves the contradiction by matching the oil supply mechanism to the actual operational needs, eliminating unnecessary compressor load during standby while ensuring reliable bearing lubrication.
2Loss of energy
If the separator tank is depressurized to eliminate load, then energy consumption is reduced, but oil flow to the bearing is interrupted
Solution Approach 1:
A dedicated pump is introduced as an intermediary device to supply oil to the bearing when the separator tank is depressurized during standby mode. This intermediary pump ensures continuous bearing lubrication without requiring separator tank pressure, thus resolving the contradiction by decoupling the bearing lubrication function from the compressor operation state.
Solution Approach 2:
The oil supply system is segmented into two independent paths: one for rotor lubrication during operation and another for bearing lubrication that can function independently during standby. This segmentation allows the bearing lubrication system to operate autonomously when the separator tank is depressurized, resolving the contradiction between energy savings and lubrication reliability.
3Reliability
If a pump is added to supply oil during standby, then bearing lubrication is maintained, but device complexity increases
Solution Approach 1:
The pump is designed with multi-functionality: it can supply oil to bearings during standby mode, and the system can operate with or without the pump depending on the operational state. This universality justifies the added complexity by providing a single component that serves multiple purposes across different operational scenarios, maintaining reliability while managing system complexity.
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 solution reduces the idle load on the compressor, conserving energy and maintaining bearing lubrication even when the compressor is not actively compressing air, thereby extending its operational lifespan and reducing energy consumption.
Implementation Method 1
a pump fluidly coupled to the separator tank to pump oil out of the separator tank
Implementation Method 2
a separator tank configured to separate oil from air compressed by the rotor
Data Source
AI summary
An oil flooded screw compressor includes a housing with an inlet and an outlet, and a rotor supported within the housing by a bearing. The rotor is rotatable to compress air from the inlet to the outlet when the compressor is in an operating state, and the rotor is rotatable without compressing air when the compressor is in an idle state. The compressor also includes a pump configured to supply oil to the bearing only when the compressor is in the idle state.