Screw Compressor Magnetic Coupling Sealing
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Solution Overview
Problem
Existing screw compressors face inefficiencies due to power losses from contact seals, wear, and separate lubrication and cooling systems, which complicate design and increase costs.
Innovation Solution
A screw compressor design where the compression housing and motor housing form a single unit, allowing for integrated drive motors and shared lubricants and coolants, with non-contact seals to maintain pressure equality and reduce energy losses, and a vertical orientation for improved fluid flow and heat recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact seal is used to seal the rotor shaft in known screw compressors, then sealing is achieved, but enormous power losses occur and efficiency is reduced
Solution Approach 1:
The patent replaces the mechanical contact seal system with a magnetic coupling system. The magnetic coupling transmits rotational force from the motor shaft to the rotor shaft without physical contact, eliminating the friction and power losses associated with contact seals while maintaining effective sealing and rotational transmission.
2Reliability
If a contact seal is used to seal the rotor shaft, then sealing is achieved, but wear occurs and leaks are sensitive to installation quality
Solution Approach 1:
The magnetic coupling system eliminates mechanical contact between the motor shaft and rotor shaft, removing the wear and installation-sensitivity problems inherent in contact seals. The non-contact magnetic field transmission provides reliable coupling without the degradation and leak issues that plague mechanical seal systems.
3Reliability
If separate lubrication and cooling systems are used for the drive motor and compressor rotors, then each component is adequately lubricated and cooled, but the systems are complicated and expensive
Solution Approach 1:
The patent merges the separate lubrication and cooling systems into a single integrated system. The magnetic coupling enables the motor and compressor to share common lubrication and cooling circuits, reducing the number of separate pumps, filters, and coolant loops while ensuring both components receive adequate lubrication and thermal management.
Solution Approach 2:
The integrated fluid system serves multiple functions simultaneously - it provides lubrication for both the motor bearings and compressor rotor bearings, and cooling for both components. This multi-functional approach eliminates the need for separate dedicated systems for each component.
4Temperature
If separate cooling systems are used for the drive motor and compressor rotors, then cooling is achieved, but heat recovery possibilities are not fully utilised
Solution Approach 1:
By merging the cooling systems, the patent creates a unified thermal management network that captures waste heat from both the motor and compressor. This integrated approach enables comprehensive heat recovery, where thermal energy from either source can be transferred to pre-cool the intake air or provide process heating, maximizing energy utilization.
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 enhances energy efficiency, reduces wear and leaks, simplifies lubrication and cooling, and allows for better thermal and acoustic insulation, leading to a more robust and cost-effective compressor.
Implementation Method 1
one end of whose rotor shaft is magnetically coupled to the other end of the motor shaft within the compression housing
Data Source
AI summary
Screw compressor with a compression chamber that is formed by a compression housing, in which a pair of meshed helical compressor rotors in the form of a screw are rotatably mounted and with a drive motor that is provided with a motor chamber formed by a motor housing, in which a motor shaft is rotatably mounted. The motor shaft drives at least one of the aforementioned two compressor rotors, where the compression housing and the motor housing are connected directly together to form a compressor housing, where the rotor shafts of the compressor rotors, as well as the motor shaft, extend along axial directions that are oblique or transverse to the horizontal plane. The motor chamber and the compression chamber have the same or similar pressure.