Flow path switching device and liquid chromatograph
JP2025132813APending Publication Date: 2025-09-10SHIMADZU SEISAKUSHO LTD
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Patent Information
- Application Number
- JP2024030625
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-09-10
AI Technical Summary
Technical Problem
Existing liquid chromatographs face issues with extra-column diffusion, turbulence, and carryover due to the formation of grooves in flow paths, leading to reduced accuracy and reliability of sample analysis.
Method used
A flow path switching device with rotors and stators that utilize through-holes instead of grooves, allowing for precise sample introduction into a separation column, reducing extra-column diffusion and carryover, and preventing mobile phase leakage.
Benefits of technology
The device enhances analysis accuracy by minimizing extra-column diffusion and carryover, ensuring precise sample introduction and maintaining consistent pressure within the chromatograph system.
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Smart Images
Figure 2025132813000001_ABST
Abstract
To more accurately analyze a sample while suppressing leakage of a mobile phase.SOLUTION: A flow path switching device includes: a column pipe P3 connected to a separation column; a first rotating body which has a first port and a first sliding surface, and in which a first through hole penetrating the first port and the first sliding surface is formed; and a second rotating body having a second sliding surface facing the first sliding surface. The second rotating body is rotatable in a state where the first sliding surface is in contact with the second sliding surface. A second through hole is formed in the second rotating body, one end of the second through hole is connectable to the first through hole when a rotation position of the second rotating body with respect to the first rotating body is a first position, and the other end of the second through hole is connected to the column pipe P3.SELECTED DRAWING: Figure 2
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Citation Information
Patent Citations
commutator
JP1977091103A