Shielding Assembly for Mass Spectrometry Injector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The heat generated by an inductively coupled plasma source in mass spectrometers causes erosion of injector components, leading to frequent replacements and operational inefficiencies in elemental analysis.
Innovation Solution
A shielding assembly is positioned between the injector body and the plasma source to prevent heat erosion, comprising a heat-resistant material such as platinum or ceramic, which can be removably or permanently coupled to the injector body and injection tube, directing heat away from the injector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an inductively coupled plasma source is used for molecular ionization and disintegration, then complete breakdown of molecules into elemental components is achieved, but heat generated from the plasma source causes erosion of the injector body
Solution Approach 1:
A shielding assembly made of heat-resistant material (platinum, ceramic, or other high-temperature resistant material) is positioned between the plasma source and the injector body. This intermediary component absorbs and reflects the heat generated by the plasma source, preventing direct thermal contact with the injector body while allowing the plasma to continue ionizing and disintegrating molecules effectively.
Solution Approach 2:
The shielding assembly is designed as a replaceable component that can be easily removed and replaced when degraded. This allows the expensive injector body to be protected and reused multiple times, while the relatively inexpensive shielding assembly absorbs the thermal damage and can be periodically replaced without affecting the core analytical functionality.
2Productivity
If the injector body is exposed to plasma heat, then molecular ionization and disintegration can occur, but frequent replacement of injector assemblies is required
Solution Approach 1:
The shielding assembly serves as a sacrificial intermediary that absorbs thermal stress and erosion, allowing the injector body to maintain its functional lifespan. The shield can be replaced independently and more frequently than the injector body, maintaining analysis productivity without requiring frequent replacement of the entire injector assembly.
Solution Approach 2:
The system is segmented into distinct replaceable components: the shielding assembly and the injector body. This segmentation allows the shielding component to be replaced independently when degraded, rather than requiring replacement of the entire injector assembly, thereby extending the operational lifespan of the injector body and reducing overall maintenance costs.
3Duration of action of stationary object
If a shielding assembly is added to protect the injector from heat, then injector lifespan is extended, but device complexity increases
Solution Approach 1:
The shielding assembly is designed as a simple, standalone component that interfaces with existing injector geometries. The shield can be attached using simple mechanical means (retaining rings, set screws, or friction fit) without requiring complex integration, minimizing the increase in device complexity while effectively extending injector lifespan.
Solution Approach 2:
The shielding assembly provides localized protection only in the specific region where thermal exposure is most severe (near the plasma source interface). Rather than redesigning the entire injector system, the shield applies protective functionality locally where needed, minimizing structural complexity changes while achieving the lifespan extension goal.
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 shielding assembly effectively reduces heat-induced erosion of the injector, extending its lifespan and maintaining analysis accuracy and efficiency by protecting the injector from plasma source heat.
Implementation Method 1
a shielding assembly positioned substantially between the injector body and the plasma source, and suitable for preventing heat generated from the plasma source from eroding the injector body
Implementation Method 2
The shielding assembly is suitable for preventing heat generated from the plasma source from eroding the injector body
Implementation Method 3
an inductively coupled plasma (ICP) ionization source... by coupling radio frequency (RF) energy into a gas stream containing the nebulized liquid or gas sample
Implementation Method 4
inductively coupled plasma mass spectrometer... inductively coupled plasma (ICP) ionization source
Data Source
AI summary
An apparatus for use in mass spectrometry comprising an injector body, an injection tube coupled to the injector body, and a shielding assembly disposed between the injector body and the injection tube. The shielding apparatus is suitable for shielding the injector body from heat generated by a plasma source.