Die-Cast Heater Block for Chromatography Mobile Phase Pre-Heating

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Solution Overview

Problem

Chromatography systems face challenges in maintaining accurate and reproducible separation results due to temperature influences on the separation performance and viscosity of the mobile phase, particularly in liquid chromatography, where maintaining constant column temperature is crucial but not adequately addressed by existing technologies.

Innovation Solution

An active pre-heater assembly is used to condition the mobile phase solvent to a specified temperature before it enters the chromatography column, comprising a thermally conductive heater block die-cast around the solvent tubing assembly, with a heater cartridge and control circuitry to manage temperature, improving manufacturability and reducing design costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional assembly methods are used to join heater block and tubing assembly, then manufacturing complexity and lead times increase, but manufacturing precision and thermal contact can be maintained

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidassembly complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The heater block and tubing assembly are merged into a single integrated component through die-casting, eliminating the need for separate assembly steps. The tubing is embedded directly into the heater block during the casting process, creating a unified structure that improves manufacturing efficiency while maintaining thermal contact.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The tubing assembly is nested within the heater block structure during the die-casting process. The tubing is positioned inside the mold cavity before the heater block material is cast around it, creating a nested configuration where the tubing is encased within the heater block for optimal thermal contact.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If heater block and tubing assembly are separately manufactured and assembled, then design flexibility is maintained, but manufacturing costs and lead times increase

Engineering Contradiction:

ImprovemanufacturabilityVSAvoidlead time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The tubing assembly is prepared and positioned in advance within the die-casting mold before the heater block material is cast. This preliminary positioning ensures that the tubing is correctly oriented and secured before the final heating assembly is formed, streamlining the manufacturing process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Traditional mechanical assembly methods (screws, adhesives, clamps) are replaced with a die-casting process that permanently bonds the tubing to the heater block through material integration. This substitution eliminates complex assembly steps and reduces manufacturing time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If conventional heating assemblies are used, then design simplicity is maintained, but thermal insulative effects reduce heating efficiency

Engineering Contradiction:

Improveheating efficiencyVSAvoidassembly integration

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The die-casting process creates a localized thermal interface between the heater block and tubing where direct metal-to-metal contact is achieved. This local optimization of thermal contact quality eliminates insulative effects at the interface while the overall assembly remains relatively simple in design.

Inventive Principle:

Principle #3Local quality

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 solution effectively maintains consistent column temperature, enhancing the accuracy and reproducibility of chromatography results while accommodating tortuous tubing configurations and reducing thermal insulative effects, particularly beneficial for supercritical fluid chromatography systems.

Implementation Method 1

Heat transfer takes place between a thermally conductive heater block containing a heater cartridge and a solvent tubing assembly which the mobile phase solvent travels through

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The heater block is die-cast about the tubing assembly such that the restraining component inhibits the tubing from rotating within the heater block

Methodology Applied

Scientific EffectMechanical constraint:

Data Source

PatentUS9557304B2Pre-column heating of mobile phase solvent in chromatography systems

Publication Date: 2017.01.31 WATERS TECHNOLOGY CORP

AI summary

An apparatus for heating a flowing fluid includes a tubing assembly, a heater block made of thermally conductive material, and a heater cartridge in thermal communication with the heater block. The heater cartridge is configured to provide heat to the heater block for transfer to fluid flowing through the tubing assembly. The apparatus also includes circuitry in electrical communication with the heater cartridge to control a temperature of the heater block by controlling operation of the heater cartridge. The heater block is die-cast about the tubing assembly.