Compressor Lubrication Loop With Pressure-Zone Segmentation
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Solution Overview
Problem
Designing and fabricating large oil flooded screw compressor coolers that can withstand high operating pressures, such as those required for high-pressure air tools, is difficult and economically infeasible due to the need for increased size and complexity of cooling circuits.
Innovation Solution
A regenerative lubrication system that includes a separator reservoir and a motor coupled to the drive system, capable of receiving pressurized air from the air compressor, separates lubricant from air and reduces lubricant pressure to transmit power back to the drive train, reducing the need for high-pressure components and enabling energy capture from the cooling fluid/lubricant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the cooling circuit components are designed to withstand high operating pressures (e.g., 500 psi), then the system can support high-pressure air tools, but the size and complexity of the cooling circuits increase significantly
Solution Approach 1:
The system divides the cooling circuit into two distinct pressure zones: a high-pressure zone (air compressor outlet to air/tools) and a low-pressure zone (oil reservoir to compressor). The oil reservoir acts as a pressure boundary, allowing the cooling components to operate at lower pressures while the air system handles high pressures. This segmentation enables using smaller, simpler cooling components without compromising the high-pressure air tool operation capability.
2Stress or pressure
If the cooling circuit components are designed to withstand high operating pressures, then the system can support high-pressure air tools, but the manufacturing cost increases
Solution Approach 1:
The oil reservoir segments the pressure zones, allowing cooling components to be manufactured for lower pressure applications. This reduces material requirements, simplifies fabrication processes, and lowers overall manufacturing costs while still enabling high-pressure air tool operation through the separate air pressure system.
Solution Approach 2:
The oil reservoir acts as an intermediary component that decouples the pressure requirements of the air system from the cooling system. By introducing this intermediate pressure boundary, the system allows high-pressure air operation without requiring the cooling circuit to withstand those high pressures, thereby reducing manufacturing complexity and cost.
3Device complexity
If air pressure is used to drive lubricant through the cooling circuit, then the lubrication system is simple, but all components must be sized for maximum operating pressure plus safety margin
Solution Approach 1:
The system uses the air pressure segment to drive oil only to the reservoir, not through the entire cooling circuit. The reservoir then becomes the starting point for a separate low-pressure oil circulation loop through the cooler and back to the compressor. This segmentation allows simple air-pressure-driven lubrication delivery while avoiding the need for high-pressure rated cooling components.
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 increases reliability and safety, lowers costs, and reduces power consumption by allowing the use of lower-rated components and optimizing energy return to the drive train, while maintaining effective cooling and lubrication of the air compressor.
Implementation Method 1
a separator reservoir configured to support lubricant and configured to receive pressurized air from the air compressor, the separator reservoir configured to separate lubricant from the air received from the air compressor
Implementation Method 2
a motor operably coupled to the drive system and configured to receive pressurized lubricant, flow of lubricant driving the motor to transmit power to the drive train
Implementation Method 3
a cooler configured to reduce a temperature of the lubricant being driven to the air compressor
Data Source
AI summary
A lubrication system is provided for supplying lubricant to an air compressor. The air compressor is driven by a drive system. The lubrication system includes a reservoir configured to support lubricant and configured to receive pressurized air from the air compressor, the separator reservoir configured to separate lubricant from the air received from the air compressor; and a motor operably coupled to the drive system and configured to receive pressurized lubricant. The motor is configured to transmit power to the drive system in at least one operating condition.