Resin Pipe Heat Exchanger for LC Detector Ghost Peak Suppression
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Solution Overview
Problem
In liquid chromatography detectors, stainless pipes can cause ion adsorption and desorption, leading to ghost peaks in chromatograms due to interactions with the mobile phase, which affects temperature stability and detection accuracy.
Innovation Solution
A detector design featuring pipes made of heat-resistant resin and a heat exchanger with a cast of low-melting-point alloy, where the winding pipe portions are embedded in the cast, preventing ion adsorption and ensuring temperature stability by efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stainless pipes are used in the detector, then temperature stability is ensured, but ghost peaks are generated due to ion adsorption and desorption
Solution Approach 1:
The harmful stainless pipe material is extracted and removed from the system. The patent replaces stainless pipes with resin pipes, eliminating the ion adsorption and desorption problem that causes ghost peaks, while maintaining temperature control functionality through alternative materials.
Solution Approach 2:
The patent employs composite material solutions by using resin pipes instead of stainless steel, and embedding these resin pipes in an aluminum block with low-melting-point alloy. This composite structure maintains thermal stability while avoiding the harmful interactions between stainless steel and the mobile phase.
2Object-generated harmful factors
If resin pipes are used to prevent ion adsorption, then ghost peaks are suppressed, but temperature control capability may be reduced
Solution Approach 1:
The aluminum block acts as an intermediary thermal management system. It provides the temperature control function that stainless steel would have provided, while the resin pipes inside avoid ion adsorption. The low-melting-point alloy embedded in the aluminum block enhances thermal contact and control efficiency.
Solution Approach 2:
The patent changes the material parameters of the pipes from metal to resin, and introduces low-melting-point alloy with specific thermal properties into the heat exchanger structure. These parameter changes enable the system to achieve both ghost peak suppression and effective temperature control.
3Power
If stainless steel is used for heat exchanger pipes, then heat transfer efficiency is maintained, but chemical resistance to mobile phase is reduced
Solution Approach 1:
The patent uses resin pipes that can be easily replaced rather than durable stainless steel pipes. While resin has lower inherent heat transfer efficiency, the system compensates through the aluminum block heat exchanger design, and the ease of replacement allows for maintenance without complex procedures.
Solution Approach 2:
The system uses a composite approach combining resin pipes for chemical resistance with an aluminum block heat exchanger for thermal management. This composite structure achieves both chemical resistance to the mobile phase and adequate heat transfer efficiency through the aluminum component.
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 design suppresses ghost peaks and maintains temperature stability, enhancing detection accuracy and responsiveness, while allowing for a wider selection of mobile phases and alloys due to the chemical resistance and high continuous use temperature of the materials used.
Implementation Method 1
a heat exchanger that adjusts a temperature of liquid introduced into the detector
Implementation Method 2
a cast formed of an alloy having a melting point lower than a continuous use temperature of the resin
Data Source
AI summary
A detector for a liquid chromatograph includes a detector that detects components in liquid, and a heat exchanger that adjusts a temperature of liquid introduced into the detector, wherein the heat exchanger includes a pipe having a winding portion, and a cast in which the winding portion is embedded, the pipe is formed of resin, and the cast is formed of an alloy having a melting point lower than a continuous use temperature of the resin.