Internal-Bearing Helical Compressor for Reduced Rotor Bending
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Solution Overview
Problem
Existing screw type compressors suffer from inefficiencies due to transmission losses, rotor bending, and the need for complex lubrication systems, which affect performance and longevity.
Innovation Solution
A compressor design featuring internal bearings and spacers within helical-shaped rotors that rotate about stationary shafts, with direct motor mounting and an enclosed lubrication system using water, minimizing transmission losses and enhancing structural support and lubrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If transmission components are used to drive the rotors, then the rotor can be driven, but transmission losses occur reducing efficiency
Solution Approach 1:
The drive mechanism is merged with the rotor assembly by directly mounting the motor on the rotor. This eliminates separate transmission components and their associated losses, while the motor-rotor integration maintains driving functionality. The bearing assembly also merges support and drive functions in one integrated unit.
Solution Approach 2:
The problematic transmission components that cause energy losses are extracted and removed from the system. Instead of using belts, gears, or other transmission elements, the design extracts these intermediaries and establishes direct motor-to-rotor connection, eliminating the source of transmission losses.
2Temperature
If traditional lubrication systems are used, then friction is reduced, but complex filtration systems are required and operating temperatures increase
Solution Approach 1:
The lubrication approach changes from oil-based traditional lubrication to water-based lubrication. This parameter change (from oil to water) fundamentally alters the system characteristics: water provides adequate lubrication for the bearing surfaces while naturally operating at lower temperatures and eliminating the need for complex filtration systems required for oil-based lubrication.
Solution Approach 2:
The design accepts that water-based lubrication may require periodic replenishment rather than using long-lasting oil lubricants. This trade-off allows using simple, inexpensive water instead of complex, expensive oil filtration and maintenance systems, particularly suitable for applications where continuous operation allows for periodic refilling.
3Reliability
If the rotor rotates without internal support, then the structure is simpler, but rotor bending occurs reducing reliability
Solution Approach 1:
The bearing assembly is nested within the hollow cavity of the rotor. This nested configuration provides internal support structure without adding external complexity. The bearing sits inside the rotor's hollow space, supporting the rotor during rotation and preventing bending while maintaining a compact integrated structure.
Solution Approach 2:
The rotor is segmented into functional zones: the hollow cavity for bearing accommodation, the helical compression surfaces for fluid compression, and the external mounting surfaces. This segmentation allows the internal bearing support structure to be independently designed and installed within the rotor cavity, providing structural support without complicating the overall rotor design.
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 design achieves higher efficiency, reduced rotor bending, and extended lifespan by eliminating transmission losses and requiring no filtration system, while maintaining effective lubrication and lower operating temperatures.
Implementation Method 1
bearing means mounted within the cavity of the male rotor for bearing the friction between the rotor and the shaft as the male rotor rotates about the stationary shaft
Implementation Method 2
an enclosed lubrication system using water, minimizing transmission losses and enhancing structural support and lubrication efficiency
Data Source
AI summary
A compressor which includes a male rotor assembly including an elongate male helical-shaped rotor having an axial cylindrical cavity therethrough, a stationary shaft axially aligned with the male rotor and through the cavity, a housing for housing the male rotor and its associated stationary shaft therein, wherein the shaft is fixed within the housing, and bearing means mounted within the cavity of the male rotor for bearing the friction between the rotor and the shaft as the male rotor rotates about the stationary shaft.