Two-Magnet Collection Unit for Reaction Cell Particle Loss
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Solution Overview
Problem
Existing examination devices face issues with magnetic particle loss during liquid suction, leading to decreased measurement accuracy due to the formation of thick magnetic particle lumps on the reaction cell wall, which can be suctioned along with the liquid.
Innovation Solution
A magnetic collection unit with two magnets, each having a length equal to or longer than the reaction cell's depth, generating a magnetic field from the liquid surface to the bottom surface, and a moving mechanism to position the magnets within the cell, ensuring magnetic particles are collected in a linear and then dot shape on the inner wall, minimizing contact with the suction nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single magnet is used to collect magnetic particles on the reaction cell wall, then the magnetic collection speed is improved, but the magnetic particles form thick lumps that can be suctioned along with the liquid
Solution Approach 1:
The single magnet is divided into two separate magnets disposed at different locations within the reaction cell. This segmentation creates multiple magnetic collection points, preventing the formation of thick lumps while maintaining collection speed. The magnetic particles are collected at multiple locations simultaneously, reducing the thickness of collected particles and preventing suction loss.
Solution Approach 2:
The magnetic collection is transitioned from a single-point collection to a distributed multi-point collection by placing two magnets at different positions (e.g., opposite sides or different heights) within the reaction cell. This dimensional distribution of magnetic field sources prevents lump formation by spreading the collection across multiple spatial locations.
2Productivity
If magnets are positioned close to the reaction cell wall to maximize field strength, then magnetic collection efficiency is improved, but the risk of particle loss during suction increases
Solution Approach 1:
Different regions of the reaction cell are utilized for different functions: magnets are positioned close to the wall in specific locations to maximize local magnetic field strength for efficient collection, while the suction nozzle operates from a different location or angle where the magnetic particle concentration is lower. This local optimization allows high collection efficiency without compromising measurement reliability.
Solution Approach 2:
The reaction cell wall acts as an intermediary between the magnets and the magnetic particles. The magnets are positioned outside or near the wall, using the wall as a medium to collect particles on its inner surface. This intermediary arrangement allows strong magnetic field application while maintaining physical separation between the magnet sources and the particle collection zone, reducing suction interference.
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 solution effectively reduces magnetic particle loss during liquid suction, maintaining measurement accuracy by ensuring uniform collection and easy separation from the nozzle, thereby improving the B/F separation process and reducing measurement errors.
Implementation Method 1
generates a magnetic field in an inside of a reaction cell accommodating a suspension containing the magnetic particles and magnetically collects the magnetic particles in the suspension on an inner wall surface of the reaction cell
Data Source
AI summary
A magnetic collection unit generates a magnetic field in an inside of a reaction cell and magnetically collects the magnetic particles in the suspension on an inner wall surface of the reaction cell, and includes a magnetic field generation unit that includes two magnets having a length equal to or longer than a distance from a liquid surface of the suspension in the reaction cell to a bottom surface of the reaction cell and generating a magnetic field across a range from the liquid surface to the bottom surface and includes a non-magnetic body, where the two magnets are disposed such that surfaces not having a magnetic pole face each other with the non-magnetic body being sandwiched therebetween, and opposite poles of the two magnets face the reaction cell; and a moving mechanism that moves the magnetic field generation unit between a magnetic collection position and a retreat position.