Floating Needle Seat for Analytical Sample Injector Alignment
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Solution Overview
Problem
Conventional sample injectors in analytical devices, such as HPLC systems, face challenges with misalignment between the needle and needle seat, requiring high positional accuracy and repeatability, which complicates the injection process and increases costs due to temperature influences and complex robotics.
Innovation Solution
A sample injector with a needle seat mounted in a floating manner, allowing automatic alignment with the approaching needle, compensating for orientation misalignment and improving alignment efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stationary needle seat and fixed needle are used, then the injection system is simple in structure, but misalignment occurs between the needle and needle seat requiring high positional accuracy and complex robotics
Solution Approach 1:
The needle seat is transformed from a stationary component to a floating, movable component that can automatically adjust its position and orientation. This dynamic design allows the needle seat to self-align with the approaching needle, eliminating the need for complex robotic positioning systems while maintaining high alignment accuracy.
Solution Approach 2:
The floating needle seat performs self-alignment through its ability to move and adjust automatically when the needle approaches. The system uses the mechanical interaction between the needle and floating needle seat to achieve automatic orientation matching, reducing dependency on external complex positioning mechanisms.
2Reliability
If high positional accuracy and repeatability are required, then injection reliability is improved, but the system becomes more complex and costly
Solution Approach 1:
The floating needle seat provides dynamic adjustment capability that ensures reliable needle-to-seat alignment. By allowing the needle seat to move and orient itself automatically, the system achieves consistent injection reliability without requiring complex positioning mechanisms or high-precision robotic control systems.
Solution Approach 2:
The system achieves reliable alignment through the self-aligning property of the floating needle seat. The mechanical design enables the needle seat to automatically adjust its position and orientation in response to the approaching needle, ensuring repeatable injection performance without external intervention or complex control systems.
3Manufacturing precision
If temperature influences are compensated for, then alignment precision is maintained, but the system requires additional control mechanisms
Solution Approach 1:
The floating needle seat design provides inherent adaptability to thermal expansion and contraction through its ability to move and adjust position. This dynamic characteristic allows the system to maintain alignment precision under varying temperature conditions without requiring active temperature compensation mechanisms or additional control systems.
Data Source
AI summary
A sample injector for an analytical device includes a needle seat configured to receive a needle for injecting a sample into an injector path. The needle seat is mounted in a floating manner so that the orientation of the needle seat is aligned automatically with respect to the orientation of the approaching needle. The sample injector may be provided in an analytical device such as a chromatographic device.