Rotary Atomizer With Magnetic Bearings and Dynamic Gas Control
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Solution Overview
Problem
Current rotary atomizers require regular maintenance and repair, leading to unnecessary costs and downtime, and they struggle to achieve high revolutions per minute (RPM) while efficiently directing and adjusting gas stream velocity.
Innovation Solution
A rotary atomizer system utilizing a permanent magnet rotor and electro-magnetic bearings, which enables frictionless support and allows for increased RPM, combined with a design that includes cooling fins and compressed air for heat management, and a mechanism to dynamically adjust gas stream velocity by modifying the gas distributor's geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rotary atomizers use traditional bearings and motors, then the structure is simpler and manufacturing cost is lower, but maintenance frequency increases and maximum RPM is limited
Solution Approach 1:
The patent replaces traditional mechanical bearings with magnetic bearings that use magnetic fields to support the rotor shaft, eliminating mechanical contact and friction. This substitution of mechanical support systems with magnetic field-based support resolves the contradiction by dramatically reducing maintenance frequency while accepting increased structural complexity in the magnetic bearing system.
Solution Approach 2:
The patent replaces conventional motors with permanent magnet motors that use magnetic fields for rotor rotation. This mechanical-to-magnetic substitution enables higher RPM operation and improved reliability by eliminating mechanical wear components, though it increases the complexity of the magnetic field generation system.
2Speed
If conventional rotary atomizers use traditional motors, then manufacturing cost is lower and structure is simpler, but maximum RPM and disc speed are limited
Solution Approach 1:
The patent employs permanent magnet motors that generate rotational force through magnetic field interaction rather than traditional electromagnetic induction. This allows the rotor to achieve much higher speeds (and thus higher disc speeds) without the mechanical limitations of conventional motors, accepting the trade-off of more complex magnetic circuit design and permanent magnet integration.
3Speed
If high-speed rotation is achieved in conventional atomizers, then disc speed increases, but heat generation and load increase requiring lubrication and cooling systems
Solution Approach 1:
The patent uses magnetic bearings to support the high-speed rotor, eliminating mechanical contact that would generate friction and heat. The magnetic field-based support system can handle high speeds without the lubrication requirements and excessive heat generation of mechanical bearings, thus enabling high rotation speeds while reducing (not eliminating) cooling needs through magnetic levitation.
4Adaptability or versatility
If fixed geometry gas distributor is used, then device complexity is lower, but ability to adjust gas stream velocity is limited
Solution Approach 1:
The patent implements a gas distributor with variable geometry that can dynamically adjust its configuration to control gas stream velocity. This dynamic adaptability allows the system to optimize gas flow characteristics for different operating conditions, accepting the trade-off of more complex movable or adjustable geometric structures in the gas distributor.
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 system achieves higher disc speeds, reduced maintenance needs, and the ability to dynamically adjust gas stream velocity, enhancing spray drying efficiency and throughput while maintaining smaller, more cost-effective designs.
Implementation Method 1
an electric motor having a stator and a permanent magnet rotor enabled to output a rotating force
Implementation Method 2
one or more magnetic bearings for enabling frictionless radial and axial support of the shaft
Implementation Method 3
cooling fins and compressed air for heat management
Data Source
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AI summary
An improved rotary disc atomizer for use in, for example, spray dryers or congealers is disclosed. The rotary disc may be directly mounted to the shaft of a high-speed electrical motor. The high-speed electrical motor comprises a permanent magnet rotor and electro-magnetic bearings. The electro-magnetic bearings may be supported by one or more upper/lower bearing housings and used to enable frictionless support of the shaft/rotor and rotary disc. The atomizer system may further comprise a gas distributor enabled to dynamically adjust the velocity at which the gas leaves the radial vanes and meets with the atomized droplets.