Filter Plate Sealing Pressure Control for Leakage Prevention
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Solution Overview
Problem
Existing filter-plate-type filtration devices face issues with raw liquid and filtrate leakage due to gaps between filter plates and capillary action, despite sealing methods like packings, which are inadequate under fluctuating pressures.
Innovation Solution
A filtration device with a pressure sealing unit that applies sealing pressure to the filter material using a sealing fluid, controlled by a unit that adjusts pressure based on sensed pressures in the raw liquid and fluid supply paths to maintain a predetermined differential pressure, preventing leakage and fluid entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter plates are pressed closely with filter material sandwiched therebetween to form filtration chamber, then filtration function is achieved, but gaps occur at contact surfaces allowing raw liquid and filtrate leakage
Solution Approach 1:
A sealing member is introduced as an intermediary component between the filter plates and filter material. This sealing member actively fills and seals gaps at the contact surfaces, preventing leakage of raw liquid and filtrate. The sealing member acts as a mediator that compensates for the insufficient contact between filter plates and filter material, thereby resolving the leakage issue while maintaining the filtration chamber structure.
Solution Approach 2:
The sealing member changes the physical parameters at the contact interface by providing elastic deformation capability. When compression force is applied, the sealing member deforms elastically to fill gaps and maintain continuous sealing contact. This parameter change (elastic deformation) allows the sealing structure to adapt to pressure variations and maintain reliable sealing performance throughout the filtration process.
2Reliability
If packings are fixed to filter plate and filter frame to seal contact portions, then sealing is improved, but sealing effectiveness deteriorates under fluctuating filtration chamber pressure
Solution Approach 1:
The sealing member is designed with elastic properties that enable dynamic adaptation to pressure fluctuations. Unlike rigid packings, the sealing member can deform and recover in response to changing filtration chamber pressure, maintaining effective sealing contact throughout the filtration cycle. This dynamic characteristic allows the sealing structure to automatically adjust to pressure variations without requiring external control mechanisms.
Solution Approach 2:
The sealing member utilizes elastic deformation as a key parameter change mechanism. When filtration chamber pressure fluctuates, the sealing member's elastic properties allow it to change its deformation state, maintaining continuous contact and sealing effectiveness. This parameter change (elastic deformation) provides the adaptability needed to respond to pressure variations, resolving the contradiction between sealing effectiveness and pressure adaptability.
3Reliability
If filter material is pressed firmly to prevent leakage, then sealing improves, but filter material may deform or damage
Solution Approach 1:
The sealing function is segmented from the filter material by introducing a separate sealing member. This sealing member specifically handles the sealing task at contact surfaces, while the filter material focuses on its filtration function. The segmentation allows each component to be optimized independently - the sealing member for sealing performance and the filter material for filtration efficiency and structural integrity.
Solution Approach 2:
The sealing member acts as an intermediary that protects the filter material from excessive compression. By positioning the sealing member between the filter plates and filter material, it absorbs the compression force needed for sealing, preventing direct transmission of high pressure to the filter material. This intermediary role maintains sealing performance while preserving filter material integrity.
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
Effectively prevents raw liquid and filtrate leakage by controlling sealing pressure to match filtration chamber pressure fluctuations, ensuring robust leakage prevention and filter accuracy.
Implementation Method 1
The pressure sealing unit has a pressure seal portion main body formed of an elastic body, and the pressure sealing unit is configured to apply the sealing pressure to the filter material by supplying a sealing fluid to deform the pressure seal portion main body
Implementation Method 2
a control unit configured to automatically control the sealing pressure in response to fluctuations in a filtration chamber pressure
Implementation Method 3
the filtrate passing through the filter material may leak from inside the filtration chamber to outside the filtration chamber through the inside of the filter material due to capillary action occurring in the filter material
Data Source
AI summary
To provide a highly convenient filter-plate-type filtration device capable of more effectively preventing leakage of a raw liquid to be filtrated and filtrate through a filter material. The filter-plate-type filtration device includes: a plurality of filter plates arranged with a filter material sandwiched therebetween; a filtration chamber formed between the plurality of filter plates; a raw liquid introduction path configured to introduce a raw liquid to be filtrated into the filtration chamber; a pressure sealing unit configured to apply a sealing pressure to the filter material such that leakage of the raw liquid to be filtrated and the filtrate from inside of the filtration chamber to outside of the filtration chamber is prevented; and a control unit configured to automatically control the sealing pressure in response to fluctuations in a pressure in the filtration chamber.