Centrifugal FFF Restriction Unit for Channel Height Control
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Solution Overview
Problem
Conventional centrifugal field-flow fractionation devices face issues with maintaining a consistent channel height due to deformation of the intermediate layer, especially when made of soft materials, which affects analysis performance.
Innovation Solution
Incorporating a restriction unit between the outer and inner surface layers of the channel member to prevent compression and maintain a certain channel height, with the option to adjust the restriction unit's thickness for precise control and improved assembly reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the intermediate layer is made of soft material such as resin, then the ease of manufacture is improved, but the manufacturing precision deteriorates due to deformation during lamination
Solution Approach 1:
A restricting member is provided in advance within the channel member structure to prevent deformation of the intermediate layer during the lamination process. This preliminary preventive measure ensures that the soft intermediate layer maintains its intended thickness and shape when layers are compressed together, resolving the contradiction between using soft materials for ease of manufacture and maintaining manufacturing precision.
2Strength
If the layers are attached while being compressed in the laminating direction, then the strength of attachment is improved, but the shape of the intermediate layer deteriorates due to deformation
Solution Approach 1:
The restricting member is built into the channel member structure before lamination occurs. This preliminary structure prevents the intermediate layer from deforming during the necessary compression process, allowing strong attachment while maintaining the intermediate layer's shape and the channel's height.
3Reliability
If the channel member is compressed to attach layers to the rotor, then the reliability of attachment is improved, but the channel height deteriorates due to compression deformation
Solution Approach 1:
The restricting member is pre-installed in the channel member to prevent deformation during the compression and attachment process. This ensures reliable attachment of the channel member to the rotor while maintaining the channel height at the required precision, resolving the contradiction between attachment reliability and manufacturing precision.
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 restriction unit effectively maintains the channel height at a consistent level, even with soft material intermediate layers, enhancing analysis reliability and reducing variations during assembly.
Implementation Method 1
causes the rotor to rotate so that particles in the liquid sample in the channel are classified by centrifugal force
Data Source
AI summary
A centrifugal field-flow fractionation device includes an annular rotor, an arc-shaped channel member, a rotation drive unit, and a restriction unit. A channel member 16 is provided along an inner peripheral surface of the rotor, has therein a channel 161 for a liquid sample by laminating a plurality of layers, and has an inlet for the liquid sample to the channel 161 and an outlet for the liquid sample from the channel 161. By rotating the rotor, particles in the liquid sample in the channel 161 are classified by centrifugal force. A restriction spacer 64 restricts the channel 161 from being compressed to a height less than a certain height when the channel member 16 is compressed and deformed in a laminating direction.