Ceramic Injection Needle Axial Force Sealing
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Solution Overview
Problem
Conventional ceramic needles used in analysis systems are brittle and face challenges with sealing issues, especially in high-pressure applications, and are difficult to mount efficiently due to their mechanical properties.
Innovation Solution
A ceramic needle with a conically tapering design, featuring a fixing body made of a ductile material and a slide-on element for exerting axial force, provides a fluid-tight coupling and centering mechanism, allowing for reliable high-pressure sealing while minimizing mechanical stress on the brittle ceramic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic needle is used to prevent contamination and carryover, then fluid handling reliability is improved, but the needle becomes brittle and difficult to mount with sealing issues in high pressure applications
Solution Approach 1:
The needle assembly is divided into separate components: a ceramic needle body, a mounting element, and a sealing element. This segmentation allows each component to be optimized for its specific function while simplifying the mounting process and reducing handling of the brittle ceramic portion.
Solution Approach 2:
A mounting element acts as an intermediary between the ceramic needle body and the fitting. This intermediary component absorbs the mechanical stress of mounting and provides the sealing function, protecting the brittle ceramic from direct mechanical handling while ensuring reliable high-pressure sealing.
2Object-generated harmful factors
If a ceramic needle is used to prevent contamination, then fluid repellant properties are improved, but sealing reliability deteriorates due to brittle character
Solution Approach 1:
A separate sealing element serves as an intermediary that provides the sealing function. This allows the ceramic needle body to maintain its fluid repellant properties without needing to provide the sealing function itself, thereby preventing carryover while ensuring sealing reliability through the dedicated sealing component.
Solution Approach 2:
The needle assembly combines ceramic material for the needle body (providing fluid repellant properties) with separate sealing materials (providing sealing reliability). This composite approach allows each material to be optimized for its specific function without compromise.
3Object-generated harmful factors
If conventional ceramic needles are used, then contamination is reduced, but mechanical stress resistance worsens due to brittle character
Solution Approach 1:
By separating the ceramic needle body from the mounting and sealing components, the design allows the ceramic to be optimized for contamination resistance while the other components provide mechanical strength and stress resistance. The ceramic portion can be kept minimal and protected from mechanical stresses.
Solution Approach 2:
The mounting element acts as a mediator that absorbs and distributes mechanical stresses away from the brittle ceramic needle body. This intermediary component protects the ceramic from mechanical stress while allowing the ceramic to maintain its contamination-resistant properties.
Data Source
AI summary
A needle for handling a fluid in an analysis system is described. The needle includes a needle body made of a ceramic material and having a fluid conduit extending between a fitting end and a seat end. The fitting end is configured to be connected to a fitting and the seat end (308) being insertable into a seat. The needle body is tapering towards the fitting end. A fixing body is arranged on the needle body next to the fitting end for exerting an axial force when the needle body is connected to the fitting, and a slide-on element to be slid over the needle body so as to push the fixing body towards the fitting end.