Multiport GC Piston Valve Assembly to Prevent Binding and Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multiport valves in gas chromatographs experience piston binding and leakage due to relative position shifts between plates during assembly, leading to operational issues such as gas blockage and leakage.
Innovation Solution
A multiport gas chromatograph piston valve design with pistons housed on a single plate, featuring two sets of pistons with different radii for gas flow paths, allowing free axial movement and reducing the overall size and material cost, while using alignment pins for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiport valves use multiple plates assembled together for piston housing, then the valve can achieve complex flow path switching capabilities, but relative position shifts between plates during assembly cause piston binding and leakage
Solution Approach 1:
The patent consolidates multiple plates into a single monoblock body structure. The pistons are housed directly within this single piece, eliminating the interfaces between multiple plates. This merging of components removes the source of position shifts and assembly errors, preventing piston binding and leakage while maintaining the complex flow path switching capability through carefully designed internal passages in the monoblock structure.
Solution Approach 2:
While the overall structure is a monoblock, the patent segments the internal flow paths into distinct channels and cavities within the single body. This internal segmentation allows for complex multiport functionality without requiring multiple external plates, maintaining versatility while ensuring positional stability through the unified structure.
2Manufacturing precision
If pistons are housed in a single plate structure, then assembly precision and piston stability are improved, but the overall valve size and material usage increase
Solution Approach 1:
The patent transitions from a planar multi-plate assembly to a three-dimensional monoblock structure with internal cavities and passages. By utilizing the vertical and internal spatial dimensions, the design accommodates multiple pistons and complex flow paths within a compact volume, achieving high manufacturing precision without excessive size increase.
Solution Approach 2:
The patent nests multiple functional elements within the single valve body structure. Internal cavities house the pistons, while interconnected passages create the multiport flow paths. This nesting approach consolidates what would traditionally require multiple separate components into one integrated unit, improving precision while controlling overall size through efficient space utilization.
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
Enhances operational reliability by preventing piston binding and leakage, ensuring consistent gas flow and reducing assembly-induced defects, thereby improving the functionality and efficiency of the gas chromatograph system.
Implementation Method 1
A first diaphragm includes a gas flow path in fluidic communication with the plurality of analytical gas ports. A second diaphragm includes a first plurality of gas pockets and a second plurality of gas pockets... The first diaphragm is disposed adjacent the bottom surface of the first plate... The second diaphragm includes a first plurality of gas pockets and a second plurality of gas pockets
Data Source
AI summary
A multiport gas chromatograph piston valve includes a first plate, a first diaphragm, a second plate, a second diaphragm, a plurality of pistons, and a third plate. The first plate has a bottom surface and includes a plurality of analytical gas ports. The first diaphragm is disposed adjacent the bottom surface of the first plate. The first diaphragm includes a gas flow path in fluidic communication with the plurality of analytical gas ports. The second plate has a plurality of apertures therethrough. The plurality of pistons, each piston having a base and a cylindrical portion that is configured to be slidably received by a respective aperture in the second plate, are disposed such that the bases of the pistons are in substantially one plane when the valve is not actuated. A second diaphragm includes a first plurality of gas pockets and a second plurality of gas pockets, wherein the first plurality of gas pockets are disposed adjacent a first set of pistons, and the second plurality of gas pockets are disposed adjacent a second set of pistons. The third plate includes a first gas activation port and a second gas activation port, the first gas activation port being fluidically coupled to the first plurality of gas pockets, and wherein the second gas activation port is coupled to the second plurality of gas pockets.