Cylindrical Needle Sample Injection Device With Integrated Washing
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Solution Overview
Problem
Conventional sample injection devices for flow-type analysis systems experience flow disturbances and 'injection shock' due to pressure fluctuations when shifting between sample drawing and injection positions, and require separate washing units that increase device size and maintenance complexity.
Innovation Solution
A sample injection device with a cylindrical needle that penetrates through the carrier-liquid channel walls, featuring a horizontal hole for sample drawing and injection, and an integrated washing mechanism, allowing for seamless transition between positions without blocking the flow and eliminating the need for separate washing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional sample injection valve is used to shift between sample drawing and injection positions, then sample injection can be performed, but the carrier-liquid channel is temporarily blocked causing flow disturbances and injection shock
Solution Approach 1:
The invention extracts the sample injection function from the main carrier-liquid flow path by using a side channel. The sample loop is connected to the carrier-liquid channel via a side channel rather than blocking the main channel, allowing sample injection without interrupting or disturbing the carrier liquid flow. This resolves the contradiction by maintaining flow stability while enabling sample injection.
Solution Approach 2:
The invention introduces a sample loop as an intermediary component between the sample source and the carrier-liquid channel. The sample is first drawn into the sample loop, then injected into the carrier liquid through the side channel. This intermediary structure prevents direct blocking of the carrier-liquid channel while achieving sample injection, thereby maintaining flow stability.
2Ease of operation
If a separate needle washing unit is provided for washing the needle after sample injection, then washing can be performed, but the device size increases and maintenance becomes more complex
Solution Approach 1:
The invention merges the needle washing function with the existing sample injection mechanism. The needle is moved to a washing position where it is rinsed using the same drive mechanism and positioning system already present for sample injection. This integration eliminates the need for a separate washing unit, reducing device size and maintenance complexity while maintaining washing capability.
Solution Approach 2:
The needle drive mechanism and positioning system are designed to serve multiple functions: sample drawing, sample injection, and needle washing. By making the positioning system universal, the invention eliminates the need for separate dedicated mechanisms for each function, thereby reducing overall device complexity and maintenance requirements.
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
This configuration prevents flow disturbances, reduces device size and maintenance needs, and enables precise and efficient sample injection with improved durability and reliability, facilitating high-performance analysis.
Implementation Method 1
a measurement pump 11 which can be connected with the needle 27 on an upper end of the needle, wherein the measurement pump 11 draws the sample into the needle 27
Data Source
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AI summary
Provided is a sample injection device for flow-type analysis including a cylindrical needle (27) which penetrates through an upper wall and a lower wall of a sample injection portion (22) of a carrier-liquid channel through ring-like sealing members (25, 26). The needle (27) includes an inner hole (41) which is closed on a side of a lower end of the needle (27) and open on an outer peripheral surface as a horizontal hole (42). The needle moving unit (44) induces the needle (27) to move downward so that the horizontal hole (42) faces an inside of a sample vessel (40) to draw the sample to the inside of the needle (27). Then the moving unit (44) induces the needle (27) to move upward so that the horizontal hole (42) faces an inside of the sample injection portion (22) to inject the sample in the inside of the needle (27). At an intermediate position, washing liquid is discharged from the horizontal hole (42) of the needle (27), and the washing liquid is recovered via a discharge path (15).