Screw Compressor Lubrication Segmentation
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Solution Overview
Problem
The existing screw compressor design results in significant stirring loss of lubricating oil, leading to performance degradation due to excessive oil stirring, particularly in the space where the suction-side bearing and mechanical seal are stored.
Innovation Solution
The screw compressor is designed with independent liquid supply routes for the shaft sealing member and the first bearing, allowing for precise control of lubricating liquid distribution, thereby minimizing excessive lubricating liquid supply and reducing stirring loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricating oil is supplied to the suction-side bearing through the space containing the bearing and mechanical seal, then the bearing is lubricated, but excessive lubricating oil accumulates in the space causing large stirring loss
Solution Approach 1:
The patent divides the lubricating oil supply into two separate routes: one route supplies oil to the shaft sealing member, and another route supplies oil to the suction-side bearing. This segmentation prevents excessive oil accumulation in the bearing space, reducing stirring loss while ensuring adequate lubrication.
Solution Approach 2:
The patent extracts the lubricating oil supply function for the suction-side bearing from the common supply space, creating a dedicated second liquid supply route that bypasses the mechanical seal space. This extraction eliminates the problem of oil accumulation and stirring loss while maintaining bearing lubrication.
2Quantity of substance
If part of the lubricating oil passes through the suction-side bearing for collection, then the amount of lubricating oil is minimized, but the bearing still stirs accumulated oil causing large stirring loss
Solution Approach 1:
The patent segments the lubricating oil flow path into two independent routes, allowing precise control of oil quantity to the suction-side bearing. The second liquid supply route delivers only the necessary amount of oil directly to the bearing, preventing accumulation and stirring loss.
3Device complexity
If a single liquid supply route is used for both shaft sealing member and first bearing, then the device complexity is reduced, but the lubrication control precision deteriorates
Solution Approach 1:
The patent divides the liquid supply system into two separate routes: the first liquid supply route supplies lubricating liquid to the shaft sealing member, and the second liquid supply route supplies lubricating liquid to the first bearing. This segmentation enables precise control of lubricating liquid supply to each component independently, preventing excessive supply to the bearing while ensuring adequate supply to the shaft sealing member.
Solution Approach 2:
The patent extracts the lubricating liquid supply function for the first bearing from the common supply system, creating a dedicated second liquid supply route. This extraction allows independent control of bearing lubrication, minimizing excessive lubricating liquid supply and reducing stirring loss.
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 design effectively suppresses stirring loss of the lubricating liquid at the first suction-side bearing, enhancing the reliability and efficiency of the screw compressor by ensuring appropriate lubrication without excessive oil stirring.
Implementation Method 1
supplying a lubricating liquid to the shaft sealing member and supplying the lubricating liquid to the first bearing
Data Source
AI summary
A screw compressor has first and second screw rotors that suck, compress, and deliver a working medium; a first bearing supporting one end of the first screw rotor coupled to a rotating shaft of a power source; a casing housing the first screw rotor and first bearing; a shaft-sealing member located on an opposite side of a tooth profiler for the first screw rotor relative to the first bearing and seals a through hole in the casing, through which a shaft of the first screw rotor coupled to the output shaft of the power source is inserted; a partition wall isolating the first bearing from the shaft-sealing member; and a liquid-supply route that is provided in the casing and has a first liquid supply opening for supplying a lubricating liquid to the shaft-sealing member and a second liquid supply opening for supplying the lubricating liquid to the first bearing.