Magnetic Seal Assembly for Agitator Torque Transmission
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Solution Overview
Problem
Current magnetic seals are inadequate for industrial-scale applications due to high power consumption, low speeds, and inability to handle corrosive and abrasive environments, as well as limitations in shaft diameter and torque requirements, leading to leakage and safety concerns in chemical reactors.
Innovation Solution
A magnetic seal assembly with a contact-free torque transmission system using outer and inner magnet assemblies, supported by rolling element bearings and anti-dust bushes, designed for vertical shaft orientation to reduce leakage and enhance safety, with features like leak detection and corrosion-resistant materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic seals are used for industrial-scale applications, then leakage is reduced, but power consumption increases and torque requirements cannot be met
Solution Approach 1:
The magnetic seal is divided into multiple magnetic assemblies arranged in series along the shaft. Each assembly contributes a portion of the total magnetic flux, allowing the system to handle high torque requirements without requiring a single oversized magnet that would consume excessive power. The segmented approach distributes the magnetic workload efficiently.
Solution Approach 2:
Multiple magnetic assemblies are combined to work together as a unified sealing system. The assemblies are positioned at different locations along the shaft and their magnetic fields are merged to create a comprehensive seal that can withstand industrial-scale pressures and torques while maintaining energy efficiency through optimized magnetic flux distribution.
2Device complexity
If conventional sealing methods like stuffing boxes are used, then device complexity is low, but continuous leakage occurs and power is lost in friction
Solution Approach 1:
The invention replaces mechanical contact-based sealing systems (stuffing boxes, mechanical seals) with a magnetic field-based sealing system. The magnetic assemblies create a contact-free seal that eliminates friction between moving parts, thereby eliminating friction power loss while maintaining sealing effectiveness. The magnetic field acts as a non-contact barrier that prevents leakage without mechanical wear.
3Reliability
If mechanical seals are used, then sealing effectiveness is improved, but barrier fluids can leak and contaminate vessel contents
Solution Approach 1:
The magnetic seal system replaces mechanical seals that require barrier fluids with a purely magnetic field-based sealing mechanism. The magnetic assemblies create a contact-free barrier that prevents process fluid leakage without requiring additional sealing fluids that could potentially leak and contaminate the vessel contents. This eliminates the source of contamination while maintaining sealing effectiveness.
4Force
If magnetic seals are designed for high torque, then industrial applications are enabled, but shaft diameter requirements increase
Solution Approach 1:
The magnetic seal is segmented into multiple assemblies that can be distributed along the shaft length. This segmentation allows the torque capacity to be increased by adding more magnetic assemblies in series rather than increasing the diameter of individual components or the shaft itself. Each assembly contributes to the total torque capacity while maintaining a compact shaft diameter.
Solution Approach 2:
Instead of increasing torque capacity by increasing shaft diameter (one-dimensional scaling), the invention distributes multiple magnetic assemblies along the length of the shaft (utilizing the longitudinal dimension). This approach enables high torque capacity while maintaining a reasonable shaft diameter by leveraging the extended arrangement of multiple smaller magnetic units.
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 seal assembly achieves low or near-zero leakage, reduces wear and tear, conserves power, eliminates the need for sealing fluids, ensures safe sealing at high pressures and temperatures, and supports large-scale industrial applications with high torque requirements.
Implementation Method 1
Magnetic flux is transmitted from the outer magnet assembly to the inner magnet assembly through walls of the chamber, thus transmitting contact-free torque
Data Source
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AI summary
The technical field of the invention relates to magnetic sealing devices used for transfer of torque involving rotating parts. Industries that deal in chemicals and pharmaceutics have a requirement to mix materials such as gases and liquids. This is carried out by mixers and agitators and similar other equipment. All devices involve a shaft that comes out of the body of the equipment, that is to say it pierces the equipment. The location at which the shaft enters the equipment is a potential point of leakage. One of the technical problems that the present invention tackles is that of providing a secure sealing that will reduce leakage. The magnetic seal assembly disclosed in the present invention provides a magnetic sealing device that gives a safe, trouble- free, robust, and leak-proof contactless seal for agitator drives and similar equipment used for industrial scale applications. The device disclosed in the present invention is used for transferring torque in industrial scale agitators wherein large volumes of liquid can be treated without leakage.