Compressor Purge Gas System with NFDLC Coated Bearings
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Solution Overview
Problem
Conventional compressor systems face inefficiencies due to oil-lubricated bearings, which result in viscous losses and require complex seal arrangements, leading to increased shaft length and material costs, as well as potential oxidation of components.
Innovation Solution
The use of near-frictionless diamond-like carbon (NFDLC) coated bushings instead of oil-lubricated bearings, supported by a self-generated dry nitrogen supply, and a purge gas system that minimizes oxidation, allowing for reduced friction and elimination of oil-lubricated bearing viscous losses and air-oil seal arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If oil-lubricated bearings are used, then bearing lubrication is maintained, but viscous losses increase and shaft length increases due to complex seal arrangements
Solution Approach 1:
The patent extracts and eliminates the oil lubrication system from the bearing assembly, replacing it with an air-lubricated bearing design. This removal of the oil system eliminates the associated viscous losses and the need for complex oil seals, thereby reducing shaft length while maintaining bearing functionality through air lubrication.
Solution Approach 2:
The patent applies pneumatic principles by using air as the lubricant for the bearings. The air-lubricated bearing system uses pressurized air to create a lubricating film between bearing surfaces, replacing the traditional oil lubrication system. This pneumatic approach eliminates oil-related viscous losses and removes the need for oil seals, resulting in reduced shaft length.
2Reliability
If oil-lubricated bearings are used, then bearing lubrication is provided, but oxidation of components occurs
Solution Approach 1:
The patent replaces oil lubrication with air lubrication in the bearing system. Since air does not cause oxidation like oil can, this pneumatic lubrication approach maintains reliable bearing operation while eliminating the harmful oxidation effect on components.
Solution Approach 2:
The patent creates an inert air environment around the bearing components to prevent oxidation. By using air (which lacks the reactive properties of oil) as the lubricant medium, the system maintains bearing lubrication reliability while protecting components from oxidative degradation.
3Reliability
If oil-lubricated bearings are used, then bearing support is provided, but complex seal arrangements are required
Solution Approach 1:
The patent removes the complex oil seal arrangements from the bearing system by eliminating oil lubrication entirely. The air-lubricated bearing design does not require oil seals to prevent leakage, as air can be contained more simply, thereby reducing device complexity while maintaining bearing support reliability.
Solution Approach 2:
The patent uses pneumatic principles to simplify the sealing requirements. Air-lubricated bearings have simpler sealing needs compared to oil-lubricated bearings because air is more easily contained and does not require the same level of sealing complexity to prevent leakage and contamination.
4Reliability
If oil-lubricated bearings are used, then bearing lubrication is maintained, but material costs increase
Solution Approach 1:
The patent extracts and eliminates the oil lubrication system and associated complex sealing components, replacing them with a simpler air-lubricated bearing design. This reduction in component count and complexity directly lowers material costs while maintaining bearing lubrication reliability through the air lubrication mechanism.
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 significantly improves compressor efficiency by reducing friction, eliminating viscous losses, and preventing oxidation, resulting in a more rigid shaft, lower material costs, and reduced air leakage, while maintaining bearing lubrication and purity.
Implementation Method 1
The use of near-frictionless diamond-like carbon (NFDLC) coated bushings instead of oil-lubricated bearings
Implementation Method 2
a purge gas system that minimizes oxidation
Data Source
AI summary
A compressor system includes a compressor having a rotor; a bearing supporting the rotor, wherein the bearing is disposed in a bearing cavity; and wherein the bearing has a near frictionless coating; and a purge gas system in fluid communication with the bearing cavity and constructed to purge air from the bearing cavity and supply the bearing cavity with the purge gas during operation of the compressor. The purge gas can be nitrogen and the near frictionless coating can be a near-frictionless diamond-like carbon coating.