Water Lubricated Compressor Negative Pressure Isolation
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Solution Overview
Problem
Existing water lubrication air compression systems face issues with overheating and leakage due to heat accumulation in synchronous gears and fatigue of shaft seals, leading to inter-contamination between oil and water lubrication systems.
Innovation Solution
A water lubrication air compression system incorporating a compressor with a water channel system for cooling, a lubricant channel system for circulating and cooling lubricants, and a negative pressure system to isolate and prevent leakage, utilizing a blower and negative pressure nozzle to maintain separation between oil and water lubrication structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water lubrication double screw compressor is used to avoid oil inter-contamination, then the compressed air is free of oil vapor, but the synchronous gears experience overheating and heat accumulation in the bearing chamber
Solution Approach 1:
The compressor is divided into functionally independent chambers: a water lubrication compression chamber for oil-free air production, and a separate oil lubrication bearing chamber for mechanical support. This segmentation allows each subsystem to optimize its lubrication method without interfering with the other, resolving the contradiction between oil-free air quality and gear cooling requirements
Solution Approach 2:
A sealed transmission mechanism acts as an intermediary between the water-lubricated compression chamber and the oil-lubricated bearing chamber. This intermediary allows power transmission while maintaining complete isolation between the two lubrication systems, enabling the synchronous gears to be cooled by oil circulation without contaminating the compressed air
2Reliability
If shaft seals are used in the compression chamber, then sealing is achieved, but long term operation causes seal fatigue and water vapor leakage into the air chambers
Solution Approach 1:
The shaft seals are extracted from the compression chamber and relocated to the bearing chamber. This extraction removes the seals from the high-stress water lubrication environment where they would fatigue, while placing them in the oil lubrication environment where they experience reduced wear and extended service life, maintaining sealing effectiveness without premature failure
Solution Approach 2:
The sealing function is copied from the compression chamber to the bearing chamber. Instead of relying on seals in the harsh water-lubricated compression chamber, the system creates a sealed bearing chamber that houses the seals, effectively duplicating the sealing function in a more favorable environment
3Reliability
If water vapor leaks into the air chambers, then the lubrication oil seals are penetrated and water vapor emulsifies the lubricant, but preventing this requires more complex sealing structures
Solution Approach 1:
The compressor is segmented into completely isolated water-lubricated and oil-lubricated zones with no shared sealing interfaces. By separating the lubrication systems into distinct chambers with independent sealed boundaries, the system eliminates the emulsification problem at its source rather than requiring complex multi-layer sealing structures to prevent it
Solution Approach 2:
The system provides beforehand protection by completely isolating the oil lubrication system from water vapor exposure through separate sealed chambers. This prior cushioning approach prevents the emulsification problem before it can occur, eliminating the need for complex sealing structures that would otherwise be required to prevent water vapor penetration
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
The system effectively cools lubricants, maintains compressor stability, and prevents inter-contamination by isolating oil and water lubrication systems, ensuring efficient operation and extended lifespan.
Implementation Method 1
a water channel system, which provides communication between an external water source and the inlet end of the compressor
Implementation Method 2
The negative pressure system is connected to the first air chamber and the second air chamber to provide a negative pressure for the first air chamber and the second air chamber
Implementation Method 3
The lubricant channel system is connected to the second bearing chamber where a lubricant in the second bearing chamber is circulated in the lubricant channel system
Data Source
AI summary
A water lubrication air compression system disposes an lubricant heat dissipation system at a bearing chamber close to the high pressure end of the compressor for cooling and circulating lubricant due to the rise of temperature during operation of the compressor, hence enhancing the ability and stability of the compressor. On the other hand, a negative pressure system is connected to the air chambers between the oil lubrication and the water lubrication of the compressor in order to provide a negative pressure. If any leak of water vapor at the compressor chamber or oil vapor at the bearing chamber, the negative pressure system is able to produce a negative pressured condition toward the sealing structure so that the oil lubrication can be effectively isolated from the water lubrication and inter-contamination between the lubricant and water can be avoided.