Magnetic Drive Coupling for Hermetic Compressor Sealing
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Solution Overview
Problem
Conventional compressor drive configurations with mechanical face seals suffer from oil and refrigerant leakage, leading to field complaints and costly rework due to the inability to maintain a hermetic seal effectively.
Innovation Solution
A magnetic drive coupling apparatus replaces the mechanical face seal with a sealed magnetic drive coupling, utilizing a hermetically sealed pressure barrier and magnetically attractive parts to transmit torque between the drive and driven units, preventing fluid leakage by using a sealing unit that encompasses the magnetically attractive parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical face seal is used to couple the compressor to the motor, then the compressor can be mechanically coupled to the drive source, but oil and refrigerant leak through the seal
Solution Approach 1:
The patent replaces the mechanical face seal coupling with a magnetic drive coupling system. The magnetic coupling uses magnetic fields to transmit rotational force from the motor to the compressor without physical contact between the drive and driven sides, eliminating the leakage path that exists in mechanical seal systems.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the motor and compressor. The magnetic coupling creates a magnetic barrier that allows torque transmission while maintaining hermetic separation, with the magnetic field acting as the mediator that transfers energy without allowing fluid passage.
2Reliability
If a hermetic seal is implemented to prevent fluid leakage, then fluid sealing is improved, but the drive configuration becomes more complex
Solution Approach 1:
The patent combines the drive coupling function and hermetic sealing function into a single integrated magnetic drive coupling assembly. The magnetic coupling structure inherently provides both torque transmission and hermetic separation, merging what would traditionally be separate functions into one unified system.
3Device complexity
If a mechanical face seal is used, then the structure is simpler, but oil leakage occurs requiring rework
Solution Approach 1:
The patent replaces the simple mechanical face seal with a magnetic drive coupling system that uses magnetic fields instead of mechanical contact. This substitution eliminates the fundamental leakage mechanism of mechanical seals while maintaining relatively simple overall system architecture.
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 magnetic drive coupling apparatus eliminates oil and refrigerant leaks, reducing repair costs and ensuring a hermetically sealed environment, thereby enhancing the reliability and efficiency of compressor operations.
Implementation Method 1
a magnetic drive coupling having first and second magnetically attractive parts associated with the first and second rotatable shafts, respectively, which transmits rotation between the first and second rotatable shafts
Data Source
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AI summary
A magnetic drive coupling apparatus is provided and includes a drive unit having a first rotatable shaft and an open drive assembly, a driven unit having an end face and a second rotatable shaft extending through the end face axially overlap, a magnetic drive coupling having first and second magnetically attractive parts associated with the first and second rotatable shafts, respectively, which transmits rotation between the first and second rotatable shafts and a sealing unit coupled to the end face to encompass the second magnetically attractive part and to hermetically seal oil and refrigerant in an interior of the driven unit.