Polymeric Screw Compressor Rotors Reduce Gas Leakage
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Solution Overview
Problem
Current screw compressors suffer from inefficiencies due to clearances between metallic rotor profiles and the compression chamber, leading to gas leakage and reduced performance, despite the use of lubricating oil for sealing and temperature control.
Innovation Solution
The use of entirely polymeric materials for the rotor propellers, specifically PEEK filled with fibers, which are produced using 3D molding or solid profile processing, reduces clearances and enhances deformability, allowing better profile adaptation and surface contact, while a separate lubrication system ensures optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic materials are used for rotor profiles, then mechanical strength is ensured, but clearances cause gas leakage and reduced efficiency
Solution Approach 1:
The patent changes the material parameter from metallic to polymeric, which fundamentally alters the clearance behavior. Polymeric materials have different thermal expansion characteristics and can deform to reduce clearances, thereby reducing gas leakage while maintaining sufficient mechanical strength for compressor operation.
Solution Approach 2:
The patent employs composite polymeric materials that combine structural polymers with reinforcing fibers. This composite approach provides both the mechanical strength required for rotor operation and the deformability needed to minimize clearances and gas leakage between rotor and stator.
2Loss of energy
If clearances are reduced to minimize gas leakage, then efficiency improves, but mechanical operation may be compromised
Solution Approach 1:
The patent utilizes the dynamic deformability of polymeric materials to adapt clearances during operation. The materials can deform under operational conditions to minimize clearances and gas leakage, while maintaining the mechanical flexibility needed for proper rotor engagement and operation.
Solution Approach 2:
By changing from rigid metallic materials to deformable polymeric materials, the system can dynamically adjust clearance parameters during operation. This allows minimal clearances for efficiency while maintaining mechanical operation through material deformability rather than rigid constraints.
3Reliability
If lubricating oil is used for sealing and temperature control, then compressor operation is maintained, but efficiency is reduced due to gas leakage
Solution Approach 1:
The patent changes the fundamental parameter of material composition from metal to polymer, which inherently reduces gas leakage through improved sealing contact. This material parameter change addresses the gas leakage issue that lubricating oil cannot fully prevent, while the polymeric materials maintain reliable operation through their own lubrication and thermal properties.
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 approach reduces gas leakage, minimizes fatigue, and improves mechanical resistance, leading to enhanced compressor efficiency and performance by adapting to operational conditions without compromising mechanical operation.
Implementation Method 1
enhances deformability, allowing better profile adaptation and surface contact
Data Source
AI summary
A screw compressor includes a male rotor and a female rotor enclosed in a casing inside which they counter-rotate, to drive the male rotor from a motor, a gas passes through an intake duct created between the two rotors, and the rotation closes this intake duct and the compressed gas is pushed towards a delivery. Each rotor includes a rotation shaft which rotates in the case due to special bearings which is surrounded by helical propellers which engage each other, the propellers being made to reduce progressively the space between rotors and casing, so that the gas sucked in by the suction duct compresses in the direction of the delivery. The helical propellers are made of a polymeric material.