Screw Compressor Magnetic Gear Eliminates Lubricant Contamination
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Solution Overview
Problem
In screw-type compressors used in refrigeration systems, the mixing of lubricant with refrigerant leads to difficulties in maintaining an adequate lubricant supply, causing contamination and increasing system costs, friction, and wear.
Innovation Solution
The integration of a magnetic gear system replaces traditional timing gears, allowing for non-contact rotation of the male and female rotors, eliminating the need for lubrication and reducing frictional losses by using magnetic fields to transmit torque between the rotors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional timing gears are used to synchronize rotor rotation, then mechanical contact and lubrication are required, but this causes contamination, increased friction, and wear
Solution Approach 1:
The patent replaces the mechanical timing gear system with a magnetic gear system that uses magnetic fields to transmit rotational motion and synchronize rotor rotation without mechanical contact. This eliminates friction, wear, and contamination associated with traditional mechanical lubrication while maintaining reliable synchronized operation.
Solution Approach 2:
The magnetic field acts as an intermediary between the drive rotor and the driven rotor, transmitting rotational motion and synchronization signals without requiring direct mechanical contact. This magnetic coupling serves as the mediator that eliminates the need for physical lubrication and mechanical contact.
2Ease of operation
If lubricant is added to lubricate compressor surfaces, then friction is reduced, but the lubricant mixes with refrigerant causing contamination and difficulty in maintaining adequate supply
Solution Approach 1:
The magnetic gear system eliminates the need for mechanical lubrication by using magnetic field coupling to transmit rotational motion. This substitution removes the source of lubricant contamination while maintaining smooth operation through magnetic interaction rather than friction-based mechanical contact.
3Reliability
If magnetic gear system is used to eliminate mechanical contact, then friction and wear are eliminated, but the complexity of the magnetic field interaction system increases
Solution Approach 1:
The patent applies magnetic field interaction to replace complex mechanical lubrication and contact systems. While magnetic field interaction may seem complex, it actually simplifies the overall system by eliminating mechanical wear, lubrication requirements, and contamination issues, resulting in a more reliable and maintenance-free compressor system.
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 reduces contamination, costs, and improves efficiency by eliminating the need for lubrication, leading to longer component life, reduced noise, and vibration, while maintaining synchronized rotor rotation.
Implementation Method 1
The first magnetic gear and the second magnetic gear are positioned such that a magnetic field of the first magnetic gear interacts with the second magnetic gear to drive rotation of the female rotor about the second axis
Data Source
AI summary
A screw compressor is provided including a casing having a suction port and a discharge port, a male rotor rotatable relative to the casing about a first axis, a female rotor rotatable relative to the casing about a second axis, and a magnetic gear system. The magnetic gear system includes a first magnetic gear associated with the male rotor and a second magnetic gear associated with the female rotor. The first magnetic gear and the second magnetic gear are positioned such that a magnetic field of the first magnetic gear interacts with the second magnetic gear to drive rotation of the female rotor about the second axis.