Microwave Drying of Filter Modules Using Frequency Tracking
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Solution Overview
Problem
Current methods for drying dialysis and closed filter systems after functional testing or washing are time-consuming and complex, especially due to the challenges posed by the dipole moment of water molecules and high surface tension, and can damage seals with conventional microwave drying.
Innovation Solution
A method using a microwave antenna chamber with high and low power zones, generating microwaves in the 2.3 to 2.6 GHz range, detecting reflected power, and adjusting frequency to maximize power dissipation in water, while passing air or gas to discharge evaporated water, ensuring gentle drying and protecting seals from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microwave drying is used, then drying speed is improved, but seals and sealants are damaged by overheating
Solution Approach 1:
The patent applies local quality by creating spatially differentiated microwave power distribution within the drying chamber. High power zones are positioned to target water-containing areas (filter elements, housing) while low power zones protect sensitive seal regions. This is achieved through strategic antenna placement and power level differentiation, allowing simultaneous rapid drying of bulk materials and gentle treatment of seals.
Solution Approach 2:
The drying process is segmented into distinct power zones rather than applying uniform microwave energy. The chamber is divided into high power zones for aggressive water removal and low power zones for gentle seal drying. This segmentation allows independent optimization of drying intensity for different components based on their thermal sensitivity and water content requirements.
2Object-affected harmful factors
If hot air blowing is used for drying, then seals are protected from damage, but drying time increases and moisture accumulates in low air flow areas
Solution Approach 1:
The patent replaces the mechanical hot air blowing system with electromagnetic microwave radiation for the primary drying mechanism. Microwaves directly heat water molecules throughout the filter assembly, eliminating the need for forced air circulation. This substitution achieves rapid, uniform drying without creating air flow dead zones where moisture could accumulate, while the low power zones simultaneously protect seals from thermal damage.
3Productivity
If uniform microwave power is applied throughout the chamber, then drying efficiency is improved, but seals and bonding areas overheat and are damaged
Solution Approach 1:
The patent implements local quality by creating spatially differentiated microwave power distribution. High power zones are positioned to maximize energy absorption in water-containing filter elements and housing, while low power zones are strategically placed to protect seal and bonding areas. This non-uniform power distribution maintains high overall drying efficiency while preventing localized overheating damage to sensitive components.
4Productivity
If microwave power is increased to reduce drying time, then productivity is improved, but reflected microwave power increases and creates dead spots
Solution Approach 1:
The patent applies dynamics by making the microwave system adaptable and responsive to changing conditions. Multiple antennas with independently controllable power levels allow real-time optimization of power distribution as the filter assembly dries. This dynamic control prevents excessive reflected power by adjusting transmission levels to match the decreasing water content, while maintaining high productivity through efficient energy transfer during each drying phase.
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 approach enables faster, more efficient, and gentler drying of closed filter systems, reducing the risk of damage to seals and improving the reproducibility of the drying process, as it selectively targets and evaporates water from different states within the filter modules.
Implementation Method 1
providing means for generating microwaves of a discrete frequency in the range of 2.3 to 2.6 GHz in said chamber; introducing microwaves of a discrete frequency at which the highest power is converted in the liquid water
Implementation Method 2
providing means for detecting reflected microwave power; further determining and adjusting the frequency of the microwave at which the highest power is lost in the water (power loss)
Implementation Method 3
passing air or gas through the filter module so that evaporated water is discharged from the system
Data Source
AI summary
A microwave chamber for drying dialysis filter cartridges, cartridge filters and other closed filter systems. The microwave chamber has separate regions of high and low microwave absorption. The high energy absorption regions are in the central region of the filter where the bundle of hollow fibers or filter material is located. The low absorption areas are the microwave sensitive end regions of the filter module. To dry the wet filter module, the microwave frequency with the highest converted power is applied, and as the filter dries, the reflected microwave power is continuously determined and kept as low as possible by tracking the microwave frequency. The water is simultaneously discharged from the module. The process allows fast and gentle drying of filter cartridges and other closed filter units such as candle filters, and eliminates accidental overheating of the temperature-sensitive end sections of filter housings and modules with the seals and adhesives.